232520509 has 12 divisors (see below), whose sum is σ = 266596596. Its totient is φ = 202006272.

The previous prime is 232520503. The next prime is 232520513. The reversal of 232520509 is 905025232.

It can be written as a sum of positive squares in 6 ways, for example, as 19448100 + 213072409 = 4410^2 + 14597^2 .

It is not a de Polignac number, because 232520509 - 2⁹ = 232519997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (232520503) 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, 37594 + ... + 43339.

It is an arithmetic number, because the mean of its divisors is an integer number (22216383).

Almost surely, 2^232520509 is an apocalyptic number.

It is an amenable number.

232520509 is a deficient number, since it is larger than the sum of its proper divisors (34076087).

232520509 is a wasteful number, since it uses less digits than its factorization.

232520509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80976 (or 80963 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 232520509 is about 15248.6231837501. The cubic root of 232520509 is about 614.9225530959.

The spelling of 232520509 in words is "two hundred thirty-two million, five hundred twenty thousand, five hundred nine".