313131402 has 12 divisors (see below), whose sum is σ = 678451410. Its totient is φ = 104377128.

The previous prime is 313131389. The next prime is 313131451. The reversal of 313131402 is 204131313.

It can be written as a sum of positive squares in only one way, i.e., 218477961 + 94653441 = 14781^2 + 9729^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 17396189 = 313131402 / (3 + 1 + 3 + 1 + 3 + 1 + 4 + 0 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8698077 + ... + 8698112.

Almost surely, 2^313131402 is an apocalyptic number.

313131402 is an abundant number, since it is smaller than the sum of its proper divisors (365320008).

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

313131402 is a wasteful number, since it uses less digits than its factorization.

313131402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17396197 (or 17396194 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 313131402 is about 17695.5192633616. The cubic root of 313131402 is about 679.0611336713.

Adding to 313131402 its reverse (204131313), we get a palindrome (517262715).

The spelling of 313131402 in words is "three hundred thirteen million, one hundred thirty-one thousand, four hundred two".