313670781 has 6 divisors (see below), whose sum is σ = 453080030. Its totient is φ = 209113848.

The previous prime is 313670779. The next prime is 313670807. The reversal of 313670781 is 187076313.

It can be written as a sum of positive squares in only one way, i.e., 303804900 + 9865881 = 17430^2 + 3141^2 .

It is not a de Polignac number, because 313670781 - 2¹ = 313670779 is a prime.

It is a super-2 number, since 2×313670781² = 196778717706299922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313670761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17426146 + ... + 17426163.

Almost surely, 2^313670781 is an apocalyptic number.

It is an amenable number.

313670781 is a deficient number, since it is larger than the sum of its proper divisors (139409249).

313670781 is a wasteful number, since it uses less digits than its factorization.

313670781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34852315 (or 34852312 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 313670781 is about 17710.7532589667. The cubic root of 313670781 is about 679.4508116246.

The spelling of 313670781 in words is "three hundred thirteen million, six hundred seventy thousand, seven hundred eighty-one".