330081721 has 8 divisors (see below), whose sum is σ = 336691080. Its totient is φ = 323486592.

The previous prime is 330081677. The next prime is 330081733. The reversal of 330081721 is 127180033.

It can be written as a sum of positive squares in 4 ways, for example, as 253956096 + 76125625 = 15936^2 + 8725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 330081721 - 2⁷ = 330081593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (330081221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51735 + ... + 57763.

It is an arithmetic number, because the mean of its divisors is an integer number (42086385).

Almost surely, 2^330081721 is an apocalyptic number.

It is an amenable number.

330081721 is a deficient number, since it is larger than the sum of its proper divisors (6609359).

330081721 is a wasteful number, since it uses less digits than its factorization.

330081721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7115.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 330081721 is about 18168.1512818448. The cubic root of 330081721 is about 691.0993613937.

The spelling of 330081721 in words is "three hundred thirty million, eighty-one thousand, seven hundred twenty-one".