| Base | Representation |
|---|---|
| bin | 110001110010101… |
| … | …0101011001110101 |
| 3 | 11022102202221121001 |
| 4 | 1203211111121311 |
| 5 | 11410201401011 |
| 6 | 433441323301 |
| 7 | 56254660654 |
| oct | 14345253165 |
| 9 | 4272687531 |
| 10 | 1670731381 |
| 11 | 7880a2240 |
| 12 | 3a7636531 |
| 13 | 20819c467 |
| 14 | 11bc6719b |
| 15 | 9ba217c1 |
| hex | 63955675 |
1670731381 has 4 divisors (see below), whose sum is σ = 1822616064. Its totient is φ = 1518846700.
The previous prime is 1670731373. The next prime is 1670731397. The reversal of 1670731381 is 1831370761.
It is a happy number.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1831370761 = 11 ⋅166488251.
It is a cyclic number.
It is not a de Polignac number, because 1670731381 - 23 = 1670731373 is a prime.
It is a super-2 number, since 2×16707313812 = 5582686694916334322, which contains 22 as substring.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 1670731381.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1670731301) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75942325 + ... + 75942346.
It is an arithmetic number, because the mean of its divisors is an integer number (455654016).
Almost surely, 21670731381 is an apocalyptic number.
1670731381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
It is an amenable number.
1670731381 is a deficient number, since it is larger than the sum of its proper divisors (151884683).
1670731381 is a wasteful number, since it uses less digits than its factorization.
1670731381 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 151884682.
The product of its (nonzero) digits is 21168, while the sum is 37.
The square root of 1670731381 is about 40874.5811110034. The cubic root of 1670731381 is about 1186.5941693478.
The spelling of 1670731381 in words is "one billion, six hundred seventy million, seven hundred thirty-one thousand, three hundred eighty-one".
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