331720257 has 16 divisors (see below), whose sum is σ = 490415040. Its totient is φ = 197745600.

The previous prime is 331720229. The next prime is 331720261. The reversal of 331720257 is 752027133.

It is not a de Polignac number, because 331720257 - 2¹⁴ = 331703873 is a prime.

It is a super-2 number, since 2×331720257² = 220076657808292098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (331720267) 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 15 ways as a sum of consecutive naturals, for example, 80382 + ... + 84407.

It is an arithmetic number, because the mean of its divisors is an integer number (30650940).

Almost surely, 2^331720257 is an apocalyptic number.

It is an amenable number.

331720257 is a deficient number, since it is larger than the sum of its proper divisors (158694783).

331720257 is a wasteful number, since it uses less digits than its factorization.

331720257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164864.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 331720257 is about 18213.1890947192. The cubic root of 331720257 is about 692.2410206859.

The spelling of 331720257 in words is "three hundred thirty-one million, seven hundred twenty thousand, two hundred fifty-seven".