523365509 has 2 divisors, whose sum is σ = 523365510. Its totient is φ = 523365508.

The previous prime is 523365503. The next prime is 523365589. The reversal of 523365509 is 905563325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505260484 + 18105025 = 22478^2 + 4255^2 .

It is a cyclic number.

It is not a de Polignac number, because 523365509 - 2¹² = 523361413 is a prime.

It is a super-2 number, since 2×523365509² = 547822912021658162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523365503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261682754 + 261682755.

It is an arithmetic number, because the mean of its divisors is an integer number (261682755).

Almost surely, 2^523365509 is an apocalyptic number.

It is an amenable number.

523365509 is a deficient number, since it is larger than the sum of its proper divisors (1).

523365509 is an equidigital number, since it uses as much as digits as its factorization.

523365509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 121500, while the sum is 38.

The square root of 523365509 is about 22877.1831526523. The cubic root of 523365509 is about 805.8762671110.

The spelling of 523365509 in words is "five hundred twenty-three million, three hundred sixty-five thousand, five hundred nine".