313405981 has 8 divisors (see below), whose sum is σ = 373751424. Its totient is φ = 256953840.

The previous prime is 313405951. The next prime is 313405991. The reversal of 313405981 is 189504313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 313405981 - 2⁷ = 313405853 is a prime.

It is a super-2 number, since 2×313405981² = 196446617853144722, 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 (313405951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 973150 + ... + 973471.

It is an arithmetic number, because the mean of its divisors is an integer number (46718928).

Almost surely, 2^313405981 is an apocalyptic number.

It is an amenable number.

313405981 is a deficient number, since it is larger than the sum of its proper divisors (60345443).

313405981 is a wasteful number, since it uses less digits than its factorization.

313405981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946651.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 313405981 is about 17703.2759962669. The cubic root of 313405981 is about 679.2595609689.

The spelling of 313405981 in words is "three hundred thirteen million, four hundred five thousand, nine hundred eighty-one".