325072721 has 4 divisors (see below), whose sum is σ = 330401844. Its totient is φ = 319743600.

The previous prime is 325072717. The next prime is 325072751. The reversal of 325072721 is 127270523.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 122323600 + 202749121 = 11060^2 + 14239^2 .

It is a cyclic number.

It is not a de Polignac number, because 325072721 - 2² = 325072717 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (325072751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2664470 + ... + 2664591.

It is an arithmetic number, because the mean of its divisors is an integer number (82600461).

Almost surely, 2^325072721 is an apocalyptic number.

It is an amenable number.

325072721 is a deficient number, since it is larger than the sum of its proper divisors (5329123).

325072721 is an equidigital number, since it uses as much as digits as its factorization.

325072721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5329122.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 325072721 is about 18029.7731821562. The cubic root of 325072721 is about 687.5857099092.

The spelling of 325072721 in words is "three hundred twenty-five million, seventy-two thousand, seven hundred twenty-one".