331721946 has 32 divisors (see below), whose sum is σ = 757087680. Its totient is φ = 107584848.

The previous prime is 331721941. The next prime is 331721977. The reversal of 331721946 is 649127133.

It is a super-2 number, since 2×331721946² = 220078898916053832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 331721946.

It is not an unprimeable number, because it can be changed into a prime (331721941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81016 + ... + 85011.

It is an arithmetic number, because the mean of its divisors is an integer number (23658990).

Almost surely, 2^331721946 is an apocalyptic number.

331721946 is an abundant number, since it is smaller than the sum of its proper divisors (425365734).

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

331721946 is a wasteful number, since it uses less digits than its factorization.

331721946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166075 (or 166069 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 331721946 is about 18213.2354621577. The cubic root of 331721946 is about 692.2421955645.

The spelling of 331721946 in words is "three hundred thirty-one million, seven hundred twenty-one thousand, nine hundred forty-six".