523165609 has 2 divisors, whose sum is σ = 523165610. Its totient is φ = 523165608.

The previous prime is 523165603. The next prime is 523165619. The reversal of 523165609 is 906561325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262440000 + 260725609 = 16200^2 + 16147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523165609 is a prime.

It is not a weakly prime, because it can be changed into another prime (523165603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261582804 + 261582805.

It is an arithmetic number, because the mean of its divisors is an integer number (261582805).

Almost surely, 2^523165609 is an apocalyptic number.

It is an amenable number.

523165609 is a deficient number, since it is larger than the sum of its proper divisors (1).

523165609 is an equidigital number, since it uses as much as digits as its factorization.

523165609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 523165609 is about 22872.8137534497. The cubic root of 523165609 is about 805.7736522861.

The spelling of 523165609 in words is "five hundred twenty-three million, one hundred sixty-five thousand, six hundred nine".