313933721 has 2 divisors, whose sum is σ = 313933722. Its totient is φ = 313933720.

The previous prime is 313933709. The next prime is 313933733. The reversal of 313933721 is 127339313.

It is a balanced prime because it is at equal distance from previous prime (313933709) and next prime (313933733).

It can be written as a sum of positive squares in only one way, i.e., 284394496 + 29539225 = 16864^2 + 5435^2 .

It is an emirp because it is prime and its reverse (127339313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313933721 - 2⁶ = 313933657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (313923721) 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 as a sum of consecutive naturals, namely, 156966860 + 156966861.

It is an arithmetic number, because the mean of its divisors is an integer number (156966861).

Almost surely, 2^313933721 is an apocalyptic number.

It is an amenable number.

313933721 is a deficient number, since it is larger than the sum of its proper divisors (1).

313933721 is an equidigital number, since it uses as much as digits as its factorization.

313933721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 32.

The square root of 313933721 is about 17718.1748777914. The cubic root of 313933721 is about 679.6406124288.

The spelling of 313933721 in words is "three hundred thirteen million, nine hundred thirty-three thousand, seven hundred twenty-one".