325516021 has 4 divisors (see below), whose sum is σ = 325564000. Its totient is φ = 325468044.

The previous prime is 325516019. The next prime is 325516067. The reversal of 325516021 is 120615523.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 325516021 - 2¹ = 325516019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (325516001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11721 + ... + 28078.

It is an arithmetic number, because the mean of its divisors is an integer number (81391000).

Almost surely, 2^325516021 is an apocalyptic number.

It is an amenable number.

325516021 is a deficient number, since it is larger than the sum of its proper divisors (47979).

325516021 is an equidigital number, since it uses as much as digits as its factorization.

325516021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47978.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 325516021 is about 18042.0625483895. The cubic root of 325516021 is about 687.8981203084.

The spelling of 325516021 in words is "three hundred twenty-five million, five hundred sixteen thousand, twenty-one".