313012031921 has 2 divisors, whose sum is σ = 313012031922. Its totient is φ = 313012031920.

The previous prime is 313012031887. The next prime is 313012031933. The reversal of 313012031921 is 129130210313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 293941802896 + 19070229025 = 542164^2 + 138095^2 .

It is a cyclic number.

It is not a de Polignac number, because 313012031921 - 2²² = 313007837617 is a prime.

It is not a weakly prime, because it can be changed into another prime (313012034921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156506015960 + 156506015961.

It is an arithmetic number, because the mean of its divisors is an integer number (156506015961).

Almost surely, 2^313012031921 is an apocalyptic number.

It is an amenable number.

313012031921 is a deficient number, since it is larger than the sum of its proper divisors (1).

313012031921 is an equidigital number, since it uses as much as digits as its factorization.

313012031921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 313012031921 in words is "three hundred thirteen billion, twelve million, thirty-one thousand, nine hundred twenty-one".