1320402231 has 6 divisors (see below), whose sum is σ = 1907247680. Its totient is φ = 880268148.

The previous prime is 1320402229. The next prime is 1320402233. The reversal of 1320402231 is 1322040231.

1320402231 is a `hidden beast` number, since 1 + 32 + 0 + 402 + 231 = 666.

It is an interprime number because it is at equal distance from previous prime (1320402229) and next prime (1320402233).

It is not a de Polignac number, because 1320402231 - 2¹ = 1320402229 is a prime.

It is a super-2 number, since 2×1320402231² = 3486924103259554722, 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 (1320402233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73355671 + ... + 73355688.

Almost surely, 2^1320402231 is an apocalyptic number.

1320402231 is a deficient number, since it is larger than the sum of its proper divisors (586845449).

1320402231 is a wasteful number, since it uses less digits than its factorization.

1320402231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146711365 (or 146711362 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1320402231 is about 36337.3393494901. The cubic root of 1320402231 is about 1097.0727213539.

Adding to 1320402231 its reverse (1322040231), we get a palindrome (2642442462).

The spelling of 1320402231 in words is "one billion, three hundred twenty million, four hundred two thousand, two hundred thirty-one".