13247631 has 12 divisors (see below), whose sum is σ = 19844552. Its totient is φ = 8831592.

The previous prime is 13247627. The next prime is 13247657. The reversal of 13247631 is 13674231.

13247631 is a `hidden beast` number, since 1 + 3 + 24 + 7 + 631 = 666.

It is not a de Polignac number, because 13247631 - 2² = 13247627 is a prime.

It is a super-2 number, since 2×13247631² = 350999454224322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13247595 and 13247604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13247621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27016 + ... + 27501.

Almost surely, 2^13247631 is an apocalyptic number.

13247631 is a deficient number, since it is larger than the sum of its proper divisors (6596921).

13247631 is an frugal number, since it uses more digits than its factorization.

13247631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54532 (or 54520 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 13247631 is about 3639.7295229179. The cubic root of 13247631 is about 236.6170710949.

The spelling of 13247631 in words is "thirteen million, two hundred forty-seven thousand, six hundred thirty-one".