331909945 has 16 divisors (see below), whose sum is σ = 404756352. Its totient is φ = 261245440.

The previous prime is 331909933. The next prime is 331909969. The reversal of 331909945 is 549909133.

It is not a de Polignac number, because 331909945 - 2¹⁵ = 331877177 is a prime.

It is a super-2 number, since 2×331909945² = 220328423179806050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107625 + ... + 110665.

It is an arithmetic number, because the mean of its divisors is an integer number (25297272).

Almost surely, 2^331909945 is an apocalyptic number.

It is an amenable number.

331909945 is a deficient number, since it is larger than the sum of its proper divisors (72846407).

331909945 is a wasteful number, since it uses less digits than its factorization.

331909945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 331909945 is about 18218.3957855789. The cubic root of 331909945 is about 692.3729438861.

The spelling of 331909945 in words is "three hundred thirty-one million, nine hundred nine thousand, nine hundred forty-five".