313121660 has 48 divisors (see below), whose sum is σ = 665945280. Its totient is φ = 123663360.

The previous prime is 313121647. The next prime is 313121687. The reversal of 313121660 is 66121313.

It is a happy number.

It is a super-2 number, since 2×313121660² = 196090347922311200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 804746 + ... + 805134.

It is an arithmetic number, because the mean of its divisors is an integer number (13873860).

Almost surely, 2^313121660 is an apocalyptic number.

It is an amenable number.

313121660 is an abundant number, since it is smaller than the sum of its proper divisors (352823620).

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

313121660 is a wasteful number, since it uses less digits than its factorization.

313121660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 313121660 is about 17695.2439937968. The cubic root of 313121660 is about 679.0540913858.

Adding to 313121660 its reverse (66121313), we get a palindrome (379242973).

The spelling of 313121660 in words is "three hundred thirteen million, one hundred twenty-one thousand, six hundred sixty".