331665457 has 4 divisors (see below), whose sum is σ = 333349236. Its totient is φ = 329981680.

The previous prime is 331665449. The next prime is 331665469. The reversal of 331665457 is 754566133.

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 321987136 + 9678321 = 17944^2 + 3111^2 .

It is a cyclic number.

It is not a de Polignac number, because 331665457 - 2³ = 331665449 is a prime.

It is a super-2 number, since 2×331665457² = 220003950734037698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331665437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841594 + ... + 841987.

It is an arithmetic number, because the mean of its divisors is an integer number (83337309).

Almost surely, 2^331665457 is an apocalyptic number.

It is an amenable number.

331665457 is a deficient number, since it is larger than the sum of its proper divisors (1683779).

331665457 is a wasteful number, since it uses less digits than its factorization.

331665457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683778.

The product of its digits is 226800, while the sum is 40.

The square root of 331665457 is about 18211.6846282819. The cubic root of 331665457 is about 692.2028993107.

The spelling of 331665457 in words is "three hundred thirty-one million, six hundred sixty-five thousand, four hundred fifty-seven".