815375489 has 2 divisors, whose sum is σ = 815375490. Its totient is φ = 815375488.

The previous prime is 815375467. The next prime is 815375521. The reversal of 815375489 is 984573518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 800437264 + 14938225 = 28292^2 + 3865^2 .

It is a cyclic number.

It is not a de Polignac number, because 815375489 - 2²⁸ = 546940033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (815375189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407687744 + 407687745.

It is an arithmetic number, because the mean of its divisors is an integer number (407687745).

Almost surely, 2^815375489 is an apocalyptic number.

It is an amenable number.

815375489 is a deficient number, since it is larger than the sum of its proper divisors (1).

815375489 is an equidigital number, since it uses as much as digits as its factorization.

815375489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 50.

The square root of 815375489 is about 28554.7804929402. The cubic root of 815375489 is about 934.2272926158.

The spelling of 815375489 in words is "eight hundred fifteen million, three hundred seventy-five thousand, four hundred eighty-nine".