232528581 has 6 divisors (see below), whose sum is σ = 335874630. Its totient is φ = 155019048.

The previous prime is 232528561. The next prime is 232528591. The reversal of 232528581 is 185825232.

232528581 is a `hidden beast` number, since 23 + 2 + 52 + 8 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 180472356 + 52056225 = 13434^2 + 7215^2 .

It is not a de Polignac number, because 232528581 - 2¹¹ = 232526533 is a prime.

It is a super-2 number, since 2×232528581² = 108139081963747122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (232528531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12918246 + ... + 12918263.

It is an arithmetic number, because the mean of its divisors is an integer number (55979105).

Almost surely, 2^232528581 is an apocalyptic number.

It is an amenable number.

232528581 is a deficient number, since it is larger than the sum of its proper divisors (103346049).

232528581 is a wasteful number, since it uses less digits than its factorization.

232528581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25836515 (or 25836512 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 232528581 is about 15248.8878610868. The cubic root of 232528581 is about 614.9296687369.

The spelling of 232528581 in words is "two hundred thirty-two million, five hundred twenty-eight thousand, five hundred eighty-one".