315023993 has 2 divisors, whose sum is σ = 315023994. Its totient is φ = 315023992.

The previous prime is 315023987. The next prime is 315024001. The reversal of 315023993 is 399320513.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 297114169 + 17909824 = 17237^2 + 4232^2 .

It is an emirp because it is prime and its reverse (399320513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315023993 is a prime.

It is not a weakly prime, because it can be changed into another prime (315023903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157511996 + 157511997.

It is an arithmetic number, because the mean of its divisors is an integer number (157511997).

Almost surely, 2^315023993 is an apocalyptic number.

It is an amenable number.

315023993 is a deficient number, since it is larger than the sum of its proper divisors (1).

315023993 is an equidigital number, since it uses as much as digits as its factorization.

315023993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 35.

The square root of 315023993 is about 17748.9152626294. The cubic root of 315023993 is about 680.4264863506.

The spelling of 315023993 in words is "three hundred fifteen million, twenty-three thousand, nine hundred ninety-three".