321491025 has 30 divisors (see below), whose sum is σ = 595516262. Its totient is φ = 171460800.

The previous prime is 321491021. The next prime is 321491047. The reversal of 321491025 is 520194123.

It can be written as a sum of positive squares in 3 ways, for example, as 77841 + 321413184 = 279^2 + 17928^2 .

It is not a de Polignac number, because 321491025 - 2² = 321491021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321491025.

It is not an unprimeable number, because it can be changed into a prime (321491021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 77356 + ... + 81405.

Almost surely, 2^321491025 is an apocalyptic number.

It is an amenable number.

321491025 is a deficient number, since it is larger than the sum of its proper divisors (274025237).

321491025 is a wasteful number, since it uses less digits than its factorization.

321491025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158783 (or 158769 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 321491025 is about 17930.1708023097. The cubic root of 321491025 is about 685.0510733226.

The spelling of 321491025 in words is "three hundred twenty-one million, four hundred ninety-one thousand, twenty-five".