331009945 has 12 divisors (see below), whose sum is σ = 462063204. Its totient is φ = 226978080.

The previous prime is 331009937. The next prime is 331009993. The reversal of 331009945 is 549900133.

It can be written as a sum of positive squares in 2 ways, for example, as 222516889 + 108493056 = 14917^2 + 10416^2 .

It is not a de Polignac number, because 331009945 - 2³ = 331009937 is a prime.

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 331009945.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 675286 + ... + 675775.

It is an arithmetic number, because the mean of its divisors is an integer number (38505267).

Almost surely, 2^331009945 is an apocalyptic number.

331009945 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

331009945 is a deficient number, since it is larger than the sum of its proper divisors (131053259).

331009945 is a wasteful number, since it uses less digits than its factorization.

331009945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351080 (or 1351073 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 331009945 is about 18193.6787099256. The cubic root of 331009945 is about 691.7465694372.

The spelling of 331009945 in words is "three hundred thirty-one million, nine thousand, nine hundred forty-five".