331690231 has 4 divisors (see below), whose sum is σ = 331866072. Its totient is φ = 331514392.

The previous prime is 331690217. The next prime is 331690243. The reversal of 331690231 is 132096133.

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

It is a cyclic number.

It is not a de Polignac number, because 331690231 - 2⁷ = 331690103 is a prime.

It is a super-2 number, since 2×331690231² = 220036818681666722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331690231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331690211) 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, 85060 + ... + 88873.

It is an arithmetic number, because the mean of its divisors is an integer number (82966518).

Almost surely, 2^331690231 is an apocalyptic number.

331690231 is a deficient number, since it is larger than the sum of its proper divisors (175841).

331690231 is a wasteful number, since it uses less digits than its factorization.

331690231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175840.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 331690231 is about 18212.3647833004. The cubic root of 331690231 is about 692.2201337532.

The spelling of 331690231 in words is "three hundred thirty-one million, six hundred ninety thousand, two hundred thirty-one".