815530109 has 2 divisors, whose sum is σ = 815530110. Its totient is φ = 815530108.

The previous prime is 815530073. The next prime is 815530117. The reversal of 815530109 is 901035518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418325209 + 397204900 = 20453^2 + 19930^2 .

It is a cyclic number.

It is not a de Polignac number, because 815530109 - 2²⁴ = 798752893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815530129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407765054 + 407765055.

It is an arithmetic number, because the mean of its divisors is an integer number (407765055).

Almost surely, 2^815530109 is an apocalyptic number.

It is an amenable number.

815530109 is a deficient number, since it is larger than the sum of its proper divisors (1).

815530109 is an equidigital number, since it uses as much as digits as its factorization.

815530109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 815530109 is about 28557.4877921711. The cubic root of 815530109 is about 934.2863415228.

The spelling of 815530109 in words is "eight hundred fifteen million, five hundred thirty thousand, one hundred nine".