331213431 has 16 divisors (see below), whose sum is σ = 468112608. Its totient is φ = 207590400.

The previous prime is 331213427. The next prime is 331213439. The reversal of 331213431 is 134312133.

It is not a de Polignac number, because 331213431 - 2² = 331213427 is a prime.

It is a super-2 number, since 2×331213431² = 219404673749583522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331213398 and 331213407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331213439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51051 + ... + 57171.

It is an arithmetic number, because the mean of its divisors is an integer number (29257038).

Almost surely, 2^331213431 is an apocalyptic number.

331213431 is a deficient number, since it is larger than the sum of its proper divisors (136899177).

331213431 is a wasteful number, since it uses less digits than its factorization.

331213431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7202.

The product of its digits is 648, while the sum is 21.

The square root of 331213431 is about 18199.2700677802. The cubic root of 331213431 is about 691.8882891554. Note that the first 3 decimals are identical.

Adding to 331213431 its reverse (134312133), we get a palindrome (465525564).

The spelling of 331213431 in words is "three hundred thirty-one million, two hundred thirteen thousand, four hundred thirty-one".