312938881 has 2 divisors, whose sum is σ = 312938882. Its totient is φ = 312938880.

The previous prime is 312938869. The next prime is 312938903. The reversal of 312938881 is 188839213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310640625 + 2298256 = 17625^2 + 1516^2 .

It is a cyclic number.

It is not a de Polignac number, because 312938881 - 2⁵ = 312938849 is a prime.

It is a super-2 number, since 2×312938881² = 195861486483064322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312938981) 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, 156469440 + 156469441.

It is an arithmetic number, because the mean of its divisors is an integer number (156469441).

Almost surely, 2^312938881 is an apocalyptic number.

It is an amenable number.

312938881 is a deficient number, since it is larger than the sum of its proper divisors (1).

312938881 is an equidigital number, since it uses as much as digits as its factorization.

312938881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 43.

The square root of 312938881 is about 17690.0786035563. The cubic root of 312938881 is about 678.9219372300.

The spelling of 312938881 in words is "three hundred twelve million, nine hundred thirty-eight thousand, eight hundred eighty-one".