12999731 has 2 divisors, whose sum is σ = 12999732. Its totient is φ = 12999730.

The previous prime is 12999719. The next prime is 12999737. The reversal of 12999731 is 13799921.

12999731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (13799921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12999731 - 2¹⁰ = 12998707 is a prime.

It is a super-2 number, since 2×12999731² = 337986012144722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12999737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6499865 + 6499866.

It is an arithmetic number, because the mean of its divisors is an integer number (6499866).

Almost surely, 2^12999731 is an apocalyptic number.

12999731 is a deficient number, since it is larger than the sum of its proper divisors (1).

12999731 is an equidigital number, since it uses as much as digits as its factorization.

12999731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 41.

The square root of 12999731 is about 3605.5139716828. The cubic root of 12999731 is about 235.1318469429.

The spelling of 12999731 in words is "twelve million, nine hundred ninety-nine thousand, seven hundred thirty-one".