313905021 has 4 divisors (see below), whose sum is σ = 418540032. Its totient is φ = 209270012.

The previous prime is 313905013. The next prime is 313905041. The reversal of 313905021 is 120509313.

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.

It is a cyclic number.

It is not a de Polignac number, because 313905021 - 2³ = 313905013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 313904982 and 313905000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313905001) 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 3 ways as a sum of consecutive naturals, for example, 52317501 + ... + 52317506.

It is an arithmetic number, because the mean of its divisors is an integer number (104635008).

Almost surely, 2^313905021 is an apocalyptic number.

It is an amenable number.

313905021 is a deficient number, since it is larger than the sum of its proper divisors (104635011).

313905021 is a wasteful number, since it uses less digits than its factorization.

313905021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104635010.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 313905021 is about 17717.3649564488. The cubic root of 313905021 is about 679.6199007533.

The spelling of 313905021 in words is "three hundred thirteen million, nine hundred five thousand, twenty-one".