1320331431 has 16 divisors (see below), whose sum is σ = 1768112640. Its totient is φ = 876395520.

The previous prime is 1320331429. The next prime is 1320331433. The reversal of 1320331431 is 1341330231.

It is an interprime number because it is at equal distance from previous prime (1320331429) and next prime (1320331433).

It is not a de Polignac number, because 1320331431 - 2¹ = 1320331429 is a prime.

It is a super-2 number, since 2×1320331431² = 3486550175373015522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1320331398 and 1320331407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320331433) 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, 1144551 + ... + 1145703.

It is an arithmetic number, because the mean of its divisors is an integer number (110507040).

Almost surely, 2^1320331431 is an apocalyptic number.

1320331431 is a deficient number, since it is larger than the sum of its proper divisors (447781209).

1320331431 is a wasteful number, since it uses less digits than its factorization.

1320331431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2486.

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

The square root of 1320331431 is about 36336.3651319171. The cubic root of 1320331431 is about 1097.0531126481.

Adding to 1320331431 its reverse (1341330231), we get a palindrome (2661661662).

The spelling of 1320331431 in words is "one billion, three hundred twenty million, three hundred thirty-one thousand, four hundred thirty-one".