311984431 has 4 divisors (see below), whose sum is σ = 340346664. Its totient is φ = 283622200.

The previous prime is 311984423. The next prime is 311984461. The reversal of 311984431 is 134489113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311984431 - 2³ = 311984423 is a prime.

It is a super-2 number, since 2×311984431² = 194668570372787522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311984411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14181100 + ... + 14181121.

It is an arithmetic number, because the mean of its divisors is an integer number (85086666).

Almost surely, 2^311984431 is an apocalyptic number.

311984431 is a deficient number, since it is larger than the sum of its proper divisors (28362233).

311984431 is a wasteful number, since it uses less digits than its factorization.

311984431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28362232.

The product of its digits is 10368, while the sum is 34.

The square root of 311984431 is about 17663.0810166290. The cubic root of 311984431 is about 678.2310068402.

The spelling of 311984431 in words is "three hundred eleven million, nine hundred eighty-four thousand, four hundred thirty-one".