331431320 has 128 divisors (see below), whose sum is σ = 877132800. Its totient is φ = 111360000.

The previous prime is 331431299. The next prime is 331431341. The reversal of 331431320 is 23134133.

It is an interprime number because it is at equal distance from previous prime (331431299) and next prime (331431341).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 331431292 and 331431301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 440945 + ... + 441695.

It is an arithmetic number, because the mean of its divisors is an integer number (6852600).

Almost surely, 2^331431320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 331431320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (438566400).

331431320 is an abundant number, since it is smaller than the sum of its proper divisors (545701480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

331431320 is a wasteful number, since it uses less digits than its factorization.

331431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849 (or 845 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 331431320 is about 18205.2552852192. The cubic root of 331431320 is about 692.0399756384.

Adding to 331431320 its reverse (23134133), we get a palindrome (354565453).

The spelling of 331431320 in words is "three hundred thirty-one million, four hundred thirty-one thousand, three hundred twenty".