312329921 has 2 divisors, whose sum is σ = 312329922. Its totient is φ = 312329920.

The previous prime is 312329917. The next prime is 312330013. The reversal of 312329921 is 129923213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199120321 + 113209600 = 14111^2 + 10640^2 .

It is a cyclic number.

It is not a de Polignac number, because 312329921 - 2² = 312329917 is a prime.

It is a super-3 number, since 3×312329921³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (312328921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156164960 + 156164961.

It is an arithmetic number, because the mean of its divisors is an integer number (156164961).

Almost surely, 2^312329921 is an apocalyptic number.

It is an amenable number.

312329921 is a deficient number, since it is larger than the sum of its proper divisors (1).

312329921 is an equidigital number, since it uses as much as digits as its factorization.

312329921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 312329921 is about 17672.8583143757. The cubic root of 312329921 is about 678.4812710252.

The spelling of 312329921 in words is "three hundred twelve million, three hundred twenty-nine thousand, nine hundred twenty-one".