325917721 has 2 divisors, whose sum is σ = 325917722. Its totient is φ = 325917720.

The previous prime is 325917679. The next prime is 325917731. The reversal of 325917721 is 127719523.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163712025 + 162205696 = 12795^2 + 12736^2 .

It is a cyclic number.

It is not a de Polignac number, because 325917721 - 2¹¹ = 325915673 is a prime.

It is not a weakly prime, because it can be changed into another prime (325917731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162958860 + 162958861.

It is an arithmetic number, because the mean of its divisors is an integer number (162958861).

Almost surely, 2^325917721 is an apocalyptic number.

It is an amenable number.

325917721 is a deficient number, since it is larger than the sum of its proper divisors (1).

325917721 is an equidigital number, since it uses as much as digits as its factorization.

325917721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 37.

The square root of 325917721 is about 18053.1914353114. The cubic root of 325917721 is about 688.1809687378.

The spelling of 325917721 in words is "three hundred twenty-five million, nine hundred seventeen thousand, seven hundred twenty-one".