313131630 has 32 divisors (see below), whose sum is σ = 858875904. Its totient is φ = 71572896.

The previous prime is 313131607. The next prime is 313131641. The reversal of 313131630 is 36131313.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 313131597 and 313131606.

It is a congruent 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, 745342 + ... + 745761.

It is an arithmetic number, because the mean of its divisors is an integer number (26839872).

Almost surely, 2^313131630 is an apocalyptic number.

313131630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

313131630 is an abundant number, since it is smaller than the sum of its proper divisors (545744274).

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

313131630 is a wasteful number, since it uses less digits than its factorization.

313131630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491120.

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 313131630 is about 17695.5257056692. The cubic root of 313131630 is about 679.0612984859.

Adding to 313131630 its reverse (36131313), we get a palindrome (349262943).

The spelling of 313131630 in words is "three hundred thirteen million, one hundred thirty-one thousand, six hundred thirty".