12664731 has 4 divisors (see below), whose sum is σ = 16886312. Its totient is φ = 8443152.

The previous prime is 12664723. The next prime is 12664733. The reversal of 12664731 is 13746621.

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

It is not a de Polignac number, because 12664731 - 2³ = 12664723 is a prime.

It is a super-3 number, since 3×12664731³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12664733) 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, 2110786 + ... + 2110791.

It is an arithmetic number, because the mean of its divisors is an integer number (4221578).

Almost surely, 2^12664731 is an apocalyptic number.

12664731 is a deficient number, since it is larger than the sum of its proper divisors (4221581).

12664731 is an equidigital number, since it uses as much as digits as its factorization.

12664731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4221580.

The product of its digits is 6048, while the sum is 30.

The square root of 12664731 is about 3558.7541359302. The cubic root of 12664731 is about 233.0944805239.

The spelling of 12664731 in words is "twelve million, six hundred sixty-four thousand, seven hundred thirty-one".