311878997 has 2 divisors, whose sum is σ = 311878998. Its totient is φ = 311878996.

The previous prime is 311878979. The next prime is 311879027. The reversal of 311878997 is 799878113.

Together with previous prime (311878979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302794801 + 9084196 = 17401^2 + 3014^2 .

It is a cyclic number.

It is not a de Polignac number, because 311878997 - 2⁶ = 311878933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311878907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155939498 + 155939499.

It is an arithmetic number, because the mean of its divisors is an integer number (155939499).

Almost surely, 2^311878997 is an apocalyptic number.

It is an amenable number.

311878997 is a deficient number, since it is larger than the sum of its proper divisors (1).

311878997 is an equidigital number, since it uses as much as digits as its factorization.

311878997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 53.

The square root of 311878997 is about 17660.0961775410. The cubic root of 311878997 is about 678.1545963340.

The spelling of 311878997 in words is "three hundred eleven million, eight hundred seventy-eight thousand, nine hundred ninety-seven".