313221905 has 16 divisors (see below), whose sum is σ = 380170560. Its totient is φ = 247724352.

The previous prime is 313221893. The next prime is 313221949. The reversal of 313221905 is 509122313.

It is a cyclic number.

It is not a de Polignac number, because 313221905 - 2¹⁴ = 313205521 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191702 + ... + 193328.

It is an arithmetic number, because the mean of its divisors is an integer number (23760660).

Almost surely, 2^313221905 is an apocalyptic number.

It is an amenable number.

313221905 is a deficient number, since it is larger than the sum of its proper divisors (66948655).

313221905 is a wasteful number, since it uses less digits than its factorization.

313221905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 313221905 is about 17698.0763078929. The cubic root of 313221905 is about 679.1265493929.

The spelling of 313221905 in words is "three hundred thirteen million, two hundred twenty-one thousand, nine hundred five".