12649631 has 4 divisors (see below), whose sum is σ = 12857064. Its totient is φ = 12442200.

The previous prime is 12649619. The next prime is 12649639. The reversal of 12649631 is 13694621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12649631 is a prime.

It is a super-2 number, since 2×12649631² = 320026328872322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12649639) 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, 103625 + ... + 103746.

It is an arithmetic number, because the mean of its divisors is an integer number (3214266).

Almost surely, 2^12649631 is an apocalyptic number.

12649631 is a deficient number, since it is larger than the sum of its proper divisors (207433).

12649631 is an equidigital number, since it uses as much as digits as its factorization.

12649631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207432.

The product of its digits is 7776, while the sum is 32.

The square root of 12649631 is about 3556.6319742138. The cubic root of 12649631 is about 233.0018051399.

The spelling of 12649631 in words is "twelve million, six hundred forty-nine thousand, six hundred thirty-one".