13047631 has 4 divisors (see below), whose sum is σ = 13064200. Its totient is φ = 13031064.

The previous prime is 13047611. The next prime is 13047637. The reversal of 13047631 is 13674031.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13047631 - 2¹⁷ = 12916559 is a prime.

It is a super-2 number, since 2×13047631² = 340481349424322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13047596 and 13047605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13047637) 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, 7041 + ... + 8698.

It is an arithmetic number, because the mean of its divisors is an integer number (3266050).

Almost surely, 2^13047631 is an apocalyptic number.

13047631 is a deficient number, since it is larger than the sum of its proper divisors (16569).

13047631 is an equidigital number, since it uses as much as digits as its factorization.

13047631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16568.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 13047631 is about 3612.1504675193. The cubic root of 13047631 is about 235.4202890751.

The spelling of 13047631 in words is "thirteen million, forty-seven thousand, six hundred thirty-one".