523508409 has 12 divisors (see below), whose sum is σ = 756558036. Its totient is φ = 348830592.

The previous prime is 523508383. The next prime is 523508411. The reversal of 523508409 is 904805325.

523508409 is a `hidden beast` number, since 523 + 50 + 84 + 0 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 298598400 + 224910009 = 17280^2 + 14997^2 .

It is not a de Polignac number, because 523508409 - 2⁷ = 523508281 is a prime.

It is a super-2 number, since 2×523508409² = 548122108587422562, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (523508429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5869 + ... + 32885.

It is an arithmetic number, because the mean of its divisors is an integer number (63046503).

Almost surely, 2^523508409 is an apocalyptic number.

It is an amenable number.

523508409 is a deficient number, since it is larger than the sum of its proper divisors (233049627).

523508409 is a wasteful number, since it uses less digits than its factorization.

523508409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29176 (or 29173 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 523508409 is about 22880.3061386862. The cubic root of 523508409 is about 805.9496060663.

The spelling of 523508409 in words is "five hundred twenty-three million, five hundred eight thousand, four hundred nine".