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6630031 = 19348949
BaseRepresentation
bin11001010010101010001111
3110110211200201
4121102222033
53144130111
6354034331
7110232352
oct31225217
913424621
106630031
113819271
1222789a7
1314b19c5
14c48299
158ae6c1
hex652a8f

6630031 has 4 divisors (see below), whose sum is σ = 6979000. Its totient is φ = 6281064.

The previous prime is 6630023. The next prime is 6630037. The reversal of 6630031 is 1300366.

Adding to 6630031 its reverse (1300366), we get a palindrome (7930397).

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1300366 = 2650183.

It is a cyclic number.

It is not a de Polignac number, because 6630031 - 23 = 6630023 is a prime.

It is a super-2 number, since 2×66300312 = 87914622121922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 348949 = 6630031 / (6 + 6 + 3 + 0 + 0 + 3 + 1).

It is a Duffinian number.

6630031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6629990 and 6630008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6630037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174456 + ... + 174493.

It is an arithmetic number, because the mean of its divisors is an integer number (1744750).

Almost surely, 26630031 is an apocalyptic number.

6630031 is the 1629-th centered pentagonal number.

6630031 is a deficient number, since it is larger than the sum of its proper divisors (348969).

6630031 is a wasteful number, since it uses less digits than its factorization.

6630031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348968.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 6630031 is about 2574.8846576109. The cubic root of 6630031 is about 187.8618175022.

The spelling of 6630031 in words is "six million, six hundred thirty thousand, thirty-one".

Divisors: 1 19 348949 6630031