312309331 has 2 divisors, whose sum is σ = 312309332. Its totient is φ = 312309330.

The previous prime is 312309317. The next prime is 312309359. The reversal of 312309331 is 133903213.

It is a weak prime.

It is an emirp because it is prime and its reverse (133903213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312309331 - 2⁵ = 312309299 is a prime.

It is a super-2 number, since 2×312309331² = 195074236459335122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 312309296 and 312309305.

It is not a weakly prime, because it can be changed into another prime (312309131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156154665 + 156154666.

It is an arithmetic number, because the mean of its divisors is an integer number (156154666).

Almost surely, 2^312309331 is an apocalyptic number.

312309331 is a deficient number, since it is larger than the sum of its proper divisors (1).

312309331 is an equidigital number, since it uses as much as digits as its factorization.

312309331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 25.

The square root of 312309331 is about 17672.2757730859. The cubic root of 312309331 is about 678.4663613251.

The spelling of 312309331 in words is "three hundred twelve million, three hundred nine thousand, three hundred thirty-one".