311664491 has 4 divisors (see below), whose sum is σ = 316947000. Its totient is φ = 306381984.

The previous prime is 311664481. The next prime is 311664497. The reversal of 311664491 is 194466113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194466113 = 229 ⋅849197.

It is a cyclic number.

It is not a de Polignac number, because 311664491 - 2¹⁰ = 311663467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311664497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2641166 + ... + 2641283.

It is an arithmetic number, because the mean of its divisors is an integer number (79236750).

Almost surely, 2^311664491 is an apocalyptic number.

311664491 is a deficient number, since it is larger than the sum of its proper divisors (5282509).

311664491 is an equidigital number, since it uses as much as digits as its factorization.

311664491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5282508.

The product of its digits is 15552, while the sum is 35.

The square root of 311664491 is about 17654.0219496861. The cubic root of 311664491 is about 677.9990856025. Note that the first 3 decimals are identical.

The spelling of 311664491 in words is "three hundred eleven million, six hundred sixty-four thousand, four hundred ninety-one".