331193431 has 4 divisors (see below), whose sum is σ = 331350264. Its totient is φ = 331036600.

The previous prime is 331193413. The next prime is 331193437. The reversal of 331193431 is 134391133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134391133 = 29 ⋅4634177.

It is a cyclic number.

It is not a de Polignac number, because 331193431 - 2¹⁷ = 331062359 is a prime.

It is a super-2 number, since 2×331193431² = 219378177475103522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331193431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331193437) 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, 75205 + ... + 79486.

It is an arithmetic number, because the mean of its divisors is an integer number (82837566).

Almost surely, 2^331193431 is an apocalyptic number.

331193431 is a deficient number, since it is larger than the sum of its proper divisors (156833).

331193431 is a wasteful number, since it uses less digits than its factorization.

331193431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156832.

The product of its digits is 2916, while the sum is 28.

The square root of 331193431 is about 18198.7205868984. The cubic root of 331193431 is about 691.8743625419.

The spelling of 331193431 in words is "three hundred thirty-one million, one hundred ninety-three thousand, four hundred thirty-one".