311685945 has 8 divisors (see below), whose sum is σ = 498697536. Its totient is φ = 166232496.

The previous prime is 311685917. The next prime is 311685947. The reversal of 311685945 is 549586113.

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

It is not a de Polignac number, because 311685945 - 2⁹ = 311685433 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 311685897 and 311685906.

It is not an unprimeable number, because it can be changed into a prime (311685947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10389517 + ... + 10389546.

It is an arithmetic number, because the mean of its divisors is an integer number (62337192).

Almost surely, 2^311685945 is an apocalyptic number.

It is an amenable number.

311685945 is a deficient number, since it is larger than the sum of its proper divisors (187011591).

311685945 is a wasteful number, since it uses less digits than its factorization.

311685945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20779071.

The product of its digits is 129600, while the sum is 42.

The square root of 311685945 is about 17654.6295628087. The cubic root of 311685945 is about 678.0146423513.

The spelling of 311685945 in words is "three hundred eleven million, six hundred eighty-five thousand, nine hundred forty-five".