311878961 has 2 divisors, whose sum is σ = 311878962. Its totient is φ = 311878960.

The previous prime is 311878951. The next prime is 311878979. The reversal of 311878961 is 169878113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192654400 + 119224561 = 13880^2 + 10919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311878961 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (311878921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155939480 + 155939481.

It is an arithmetic number, because the mean of its divisors is an integer number (155939481).

Almost surely, 2^311878961 is an apocalyptic number.

It is an amenable number.

311878961 is a deficient number, since it is larger than the sum of its proper divisors (1).

311878961 is an equidigital number, since it uses as much as digits as its factorization.

311878961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 44.

The square root of 311878961 is about 17660.0951582940. The cubic root of 311878961 is about 678.1545702411.

The spelling of 311878961 in words is "three hundred eleven million, eight hundred seventy-eight thousand, nine hundred sixty-one".