325615921 has 2 divisors, whose sum is σ = 325615922. Its totient is φ = 325615920.

The previous prime is 325615907. The next prime is 325615937. The reversal of 325615921 is 129516523.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204175521 + 121440400 = 14289^2 + 11020^2 .

It is a cyclic number.

It is not a de Polignac number, because 325615921 - 2⁷ = 325615793 is a prime.

It is equal to p_17561806 and since 325615921 and 17561806 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (325615321) 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 as a sum of consecutive naturals, namely, 162807960 + 162807961.

It is an arithmetic number, because the mean of its divisors is an integer number (162807961).

Almost surely, 2^325615921 is an apocalyptic number.

It is an amenable number.

325615921 is a deficient number, since it is larger than the sum of its proper divisors (1).

325615921 is an equidigital number, since it uses as much as digits as its factorization.

325615921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 34.

The square root of 325615921 is about 18044.8308664836. The cubic root of 325615921 is about 687.9684844778.

The spelling of 325615921 in words is "three hundred twenty-five million, six hundred fifteen thousand, nine hundred twenty-one".