320521131 has 24 divisors (see below), whose sum is σ = 548713984. Its totient is φ = 183153960.

The previous prime is 320521087. The next prime is 320521133. The reversal of 320521131 is 131125023.

It is not a de Polignac number, because 320521131 - 2⁹ = 320520619 is a prime.

It is a super-2 number, since 2×320521131² = 205467590835038322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (320521133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92515 + ... + 95916.

Almost surely, 2^320521131 is an apocalyptic number.

320521131 is a deficient number, since it is larger than the sum of its proper divisors (228192853).

320521131 is an equidigital number, since it uses as much as digits as its factorization.

320521131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188453 (or 188441 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 320521131 is about 17903.1039487570. The cubic root of 320521131 is about 684.3614779088.

Adding to 320521131 its reverse (131125023), we get a palindrome (451646154).

It can be divided in two parts, 3205 and 21131, that added together give a square (24336 = 156²).

The spelling of 320521131 in words is "three hundred twenty million, five hundred twenty-one thousand, one hundred thirty-one".