331665631 has 8 divisors (see below), whose sum is σ = 383100624. Its totient is φ = 283777920.

The previous prime is 331665619. The next prime is 331665643. The reversal of 331665631 is 136566133.

It is an interprime number because it is at equal distance from previous prime (331665619) and next prime (331665643).

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 331665631 - 2¹¹ = 331663583 is a prime.

It is a super-2 number, since 2×331665631² = 220004181573256322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331665661) 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, 886620 + ... + 886993.

It is an arithmetic number, because the mean of its divisors is an integer number (47887578).

Almost surely, 2^331665631 is an apocalyptic number.

331665631 is a deficient number, since it is larger than the sum of its proper divisors (51434993).

331665631 is a wasteful number, since it uses less digits than its factorization.

331665631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773641.

The product of its digits is 29160, while the sum is 34.

The square root of 331665631 is about 18211.6894054341. The cubic root of 331665631 is about 692.2030203597.

The spelling of 331665631 in words is "three hundred thirty-one million, six hundred sixty-five thousand, six hundred thirty-one".