311691087 has 6 divisors (see below), whose sum is σ = 450220472. Its totient is φ = 207794052.

The previous prime is 311691077. The next prime is 311691091. The reversal of 311691087 is 780196113.

It is not a de Polignac number, because 311691087 - 2⁸ = 311690831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311691007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17316163 + ... + 17316180.

Almost surely, 2^311691087 is an apocalyptic number.

311691087 is a deficient number, since it is larger than the sum of its proper divisors (138529385).

311691087 is a wasteful number, since it uses less digits than its factorization.

311691087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34632349 (or 34632346 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 311691087 is about 17654.7751897327. The cubic root of 311691087 is about 678.0183708182.

The spelling of 311691087 in words is "three hundred eleven million, six hundred ninety-one thousand, eighty-seven".