525605581 has 4 divisors (see below), whose sum is σ = 525716572. Its totient is φ = 525494592.

The previous prime is 525605579. The next prime is 525605603. The reversal of 525605581 is 185506525.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 238980681 + 286624900 = 15459^2 + 16930^2 .

It is a cyclic number.

It is not a de Polignac number, because 525605581 - 2¹ = 525605579 is a prime.

It is a super-2 number, since 2×525605581² = 552522453556695122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 525605581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525605501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48060 + ... + 57973.

It is an arithmetic number, because the mean of its divisors is an integer number (131429143).

Almost surely, 2^525605581 is an apocalyptic number.

It is an amenable number.

525605581 is a deficient number, since it is larger than the sum of its proper divisors (110991).

525605581 is a wasteful number, since it uses less digits than its factorization.

525605581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110990.

The product of its (nonzero) digits is 60000, while the sum is 37.

The square root of 525605581 is about 22926.0895269996. The cubic root of 525605581 is about 807.0243821543.

The spelling of 525605581 in words is "five hundred twenty-five million, six hundred five thousand, five hundred eighty-one".