310724021 has 2 divisors, whose sum is σ = 310724022. Its totient is φ = 310724020.

The previous prime is 310723991. The next prime is 310724027. The reversal of 310724021 is 120427013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190053796 + 120670225 = 13786^2 + 10985^2 .

It is a cyclic number.

It is not a de Polignac number, because 310724021 - 2²⁶ = 243615157 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 310723984 and 310724002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (310724027) by changing a digit.

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 as a sum of consecutive naturals, namely, 155362010 + 155362011.

It is an arithmetic number, because the mean of its divisors is an integer number (155362011).

Almost surely, 2^310724021 is an apocalyptic number.

It is an amenable number.

310724021 is a deficient number, since it is larger than the sum of its proper divisors (1).

310724021 is an equidigital number, since it uses as much as digits as its factorization.

310724021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 310724021 is about 17627.3656852066. The cubic root of 310724021 is about 677.3164281632.

The spelling of 310724021 in words is "three hundred ten million, seven hundred twenty-four thousand, twenty-one".