311305972 has 12 divisors (see below), whose sum is σ = 576831780. Its totient is φ = 146496896.

The previous prime is 311305933. The next prime is 311306003. The reversal of 311305972 is 279503113.

It can be written as a sum of positive squares in 2 ways, for example, as 210424036 + 100881936 = 14506^2 + 10044^2 .

It is a super-2 number, since 2×311305972² = 193822816405729568, which contains 22 as substring.

It is a congruent 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, 2288947 + ... + 2289082.

It is an arithmetic number, because the mean of its divisors is an integer number (48069315).

Almost surely, 2^311305972 is an apocalyptic number.

It is an amenable number.

311305972 is a deficient number, since it is larger than the sum of its proper divisors (265525808).

311305972 is a wasteful number, since it uses less digits than its factorization.

311305972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578050 (or 4578048 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 311305972 is about 17643.8649960829. The cubic root of 311305972 is about 677.7390101827.

The spelling of 311305972 in words is "three hundred eleven million, three hundred five thousand, nine hundred seventy-two".