312331109 has 2 divisors, whose sum is σ = 312331110. Its totient is φ = 312331108.

The previous prime is 312331081. The next prime is 312331133. The reversal of 312331109 is 901133213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 301994884 + 10336225 = 17378^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 312331109 - 2⁸ = 312330853 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312331009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156165554 + 156165555.

It is an arithmetic number, because the mean of its divisors is an integer number (156165555).

Almost surely, 2^312331109 is an apocalyptic number.

It is an amenable number.

312331109 is a deficient number, since it is larger than the sum of its proper divisors (1).

312331109 is an equidigital number, since it uses as much as digits as its factorization.

312331109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 312331109 is about 17672.8919252057. The cubic root of 312331109 is about 678.4821312637.

The spelling of 312331109 in words is "three hundred twelve million, three hundred thirty-one thousand, one hundred nine".