815530169 has 2 divisors, whose sum is σ = 815530170. Its totient is φ = 815530168.

The previous prime is 815530147. The next prime is 815530187. The reversal of 815530169 is 961035518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784672144 + 30858025 = 28012^2 + 5555^2 .

It is a cyclic number.

It is not a de Polignac number, because 815530169 - 2²⁰ = 814481593 is a prime.

It is a super-2 number, since 2×815530169² = 1330178913098337122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (815530109) 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, 407765084 + 407765085.

It is an arithmetic number, because the mean of its divisors is an integer number (407765085).

Almost surely, 2^815530169 is an apocalyptic number.

It is an amenable number.

815530169 is a deficient number, since it is larger than the sum of its proper divisors (1).

815530169 is an equidigital number, since it uses as much as digits as its factorization.

815530169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 815530169 is about 28557.4888426836. The cubic root of 815530169 is about 934.2863644352.

The spelling of 815530169 in words is "eight hundred fifteen million, five hundred thirty thousand, one hundred sixty-nine".