313781919 has 16 divisors (see below), whose sum is σ = 460187904. Its totient is φ = 190168440.

The previous prime is 313781911. The next prime is 313781929. The reversal of 313781919 is 919187313.

It is not a de Polignac number, because 313781919 - 2³ = 313781911 is a prime.

It is a super-2 number, since 2×313781919² = 196918185382645122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313781911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35299 + ... + 43284.

It is an arithmetic number, because the mean of its divisors is an integer number (28761744).

Almost surely, 2^313781919 is an apocalyptic number.

313781919 is a deficient number, since it is larger than the sum of its proper divisors (146405985).

313781919 is an equidigital number, since it uses as much as digits as its factorization.

313781919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78619 (or 78597 counting only the distinct ones).

The product of its digits is 40824, while the sum is 42.

The square root of 313781919 is about 17713.8905664453. The cubic root of 313781919 is about 679.5310484973.

The spelling of 313781919 in words is "three hundred thirteen million, seven hundred eighty-one thousand, nine hundred nineteen".