313883981 has 4 divisors (see below), whose sum is σ = 313924512. Its totient is φ = 313843452.

The previous prime is 313883909. The next prime is 313883993. The reversal of 313883981 is 189388313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 189388313 = 17 ⋅11140489.

It is a cyclic number.

It is not a de Polignac number, because 313883981 - 2¹⁸ = 313621837 is a prime.

It is a super-2 number, since 2×313883981² = 197046307056816722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313883081) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4625 + ... + 25478.

It is an arithmetic number, because the mean of its divisors is an integer number (78481128).

Almost surely, 2^313883981 is an apocalyptic number.

It is an amenable number.

313883981 is a deficient number, since it is larger than the sum of its proper divisors (40531).

313883981 is a wasteful number, since it uses less digits than its factorization.

313883981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40530.

The product of its digits is 124416, while the sum is 44.

The square root of 313883981 is about 17716.7711787447. The cubic root of 313883981 is about 679.6047162004.

The spelling of 313883981 in words is "three hundred thirteen million, eight hundred eighty-three thousand, nine hundred eighty-one".