331305906 has 8 divisors (see below), whose sum is σ = 662611824. Its totient is φ = 110435300.

The previous prime is 331305883. The next prime is 331305913. The reversal of 331305906 is 609503133.

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

331305906 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27608820 + ... + 27608831.

It is an arithmetic number, because the mean of its divisors is an integer number (82826478).

Almost surely, 2^331305906 is an apocalyptic number.

331305906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

331305906 is a wasteful number, since it uses less digits than its factorization.

331305906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55217656.

The product of its (nonzero) digits is 7290, while the sum is 30.

The square root of 331305906 is about 18201.8105143417. The cubic root of 331305906 is about 691.9526750466.

The spelling of 331305906 in words is "three hundred thirty-one million, three hundred five thousand, nine hundred six".