Base | Representation |
---|---|
bin | 101001010001111… |
… | …1001100110000101 |
3 | 10120112101112112001 |
4 | 1102203321212011 |
5 | 10314044031121 |
6 | 345240225301 |
7 | 46216342540 |
oct | 12243714605 |
9 | 3515345461 |
10 | 1385142661 |
11 | 650971201 |
12 | 327a6b231 |
13 | 190c79056 |
14 | d1d65857 |
15 | 8190c991 |
hex | 528f9985 |
1385142661 has 16 divisors (see below), whose sum is σ = 1620346624. Its totient is φ = 1159588224.
The previous prime is 1385142641. The next prime is 1385142667. The reversal of 1385142661 is 1662415831.
It is a happy number.
1385142661 is a nontrivial binomial coefficient, being equal to C(52634, 2).
It is a 4-Lehmer number, since φ(1385142661) divides (1385142661-1)4.
It is a cyclic number.
It is not a de Polignac number, because 1385142661 - 29 = 1385142149 is a prime.
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 1385142661.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1385142667) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39475 + ... + 65791.
It is an arithmetic number, because the mean of its divisors is an integer number (101271664).
It is a Poulet number, since it divides 21385142660-1.
Almost surely, 21385142661 is an apocalyptic number.
1385142661 is the 52633-rd triangular number and also the 26317-th hexagonal number.
1385142661 is the 17545-th centered nonagonal number.
It is an amenable number.
1385142661 is a deficient number, since it is larger than the sum of its proper divisors (235203963).
1385142661 is a wasteful number, since it uses less digits than its factorization.
1385142661 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 26500.
The product of its digits is 34560, while the sum is 37.
The square root of 1385142661 is about 37217.5047659028. The cubic root of 1385142661 is about 1114.7175408441.
The spelling of 1385142661 in words is "one billion, three hundred eighty-five million, one hundred forty-two thousand, six hundred sixty-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.069 sec. • engine limits •