1320515231 has 16 divisors (see below), whose sum is σ = 1522737216. Its totient is φ = 1121734656.

The previous prime is 1320515227. The next prime is 1320515279. The reversal of 1320515231 is 1325150231.

It is a happy number.

It is not a de Polignac number, because 1320515231 - 2² = 1320515227 is a prime.

It is a super-2 number, since 2×1320515231² = 3487520950605966722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1320515197 and 1320515206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320515201) 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, 380255 + ... + 383711.

It is an arithmetic number, because the mean of its divisors is an integer number (95171076).

Almost surely, 2^1320515231 is an apocalyptic number.

1320515231 is a deficient number, since it is larger than the sum of its proper divisors (202221985).

1320515231 is a wasteful number, since it uses less digits than its factorization.

1320515231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1320515231 is about 36338.8941906602. The cubic root of 1320515231 is about 1097.1040162827.

Adding to 1320515231 its reverse (1325150231), we get a palindrome (2645665462).

The spelling of 1320515231 in words is "one billion, three hundred twenty million, five hundred fifteen thousand, two hundred thirty-one".