312565091 has 2 divisors, whose sum is σ = 312565092. Its totient is φ = 312565090.

The previous prime is 312565081. The next prime is 312565109. The reversal of 312565091 is 190565213.

Together with next prime (312565109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312565091 - 2¹⁴ = 312548707 is a prime.

It is a super-2 number, since 2×312565091² = 195393872223676562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (312565081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156282545 + 156282546.

It is an arithmetic number, because the mean of its divisors is an integer number (156282546).

Almost surely, 2^312565091 is an apocalyptic number.

312565091 is a deficient number, since it is larger than the sum of its proper divisors (1).

312565091 is an equidigital number, since it uses as much as digits as its factorization.

312565091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 312565091 is about 17679.5104853047. The cubic root of 312565091 is about 678.6515166531.

The spelling of 312565091 in words is "three hundred twelve million, five hundred sixty-five thousand, ninety-one".