315335021 has 2 divisors, whose sum is σ = 315335022. Its totient is φ = 315335020.

The previous prime is 315334993. The next prime is 315335063. The reversal of 315335021 is 120533513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271920100 + 43414921 = 16490^2 + 6589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315335021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315335071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157667510 + 157667511.

It is an arithmetic number, because the mean of its divisors is an integer number (157667511).

Almost surely, 2^315335021 is an apocalyptic number.

It is an amenable number.

315335021 is a deficient number, since it is larger than the sum of its proper divisors (1).

315335021 is an equidigital number, since it uses as much as digits as its factorization.

315335021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 315335021 is about 17757.6749885789. The cubic root of 315335021 is about 680.6503445149.

Adding to 315335021 its reverse (120533513), we get a palindrome (435868534).

The spelling of 315335021 in words is "three hundred fifteen million, three hundred thirty-five thousand, twenty-one".