12977831 has 2 divisors, whose sum is σ = 12977832. Its totient is φ = 12977830.

The previous prime is 12977827. The next prime is 12977837. The reversal of 12977831 is 13877921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12977831 - 2² = 12977827 is a prime.

It is a super-2 number, since 2×12977831² = 336848194929122, which contains 22 as substring.

It is a Sophie Germain prime.

It is equal to p₈₄₇₈₉₂ and since 12977831 and 847892 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12977837) 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 as a sum of consecutive naturals, namely, 6488915 + 6488916.

It is an arithmetic number, because the mean of its divisors is an integer number (6488916).

Almost surely, 2^12977831 is an apocalyptic number.

12977831 is a deficient number, since it is larger than the sum of its proper divisors (1).

12977831 is an equidigital number, since it uses as much as digits as its factorization.

12977831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 38.

The square root of 12977831 is about 3602.4756765313. The cubic root of 12977831 is about 234.9997344195. Note that the first 3 decimals are identical.

The spelling of 12977831 in words is "twelve million, nine hundred seventy-seven thousand, eight hundred thirty-one".