815525 has 6 divisors (see below), whose sum is σ = 1011282. Its totient is φ = 652400.

The previous prime is 815519. The next prime is 815527. The reversal of 815525 is 525518.

815525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 70756 + 744769 = 266^2 + 863^2 .

It is not a de Polignac number, because 815525 - 2¹⁰ = 814501 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 815494 and 815503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815527) 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, 16286 + ... + 16335.

It is an arithmetic number, because the mean of its divisors is an integer number (168547).

2⁸¹⁵⁵²⁵ is an apocalyptic number.

It is an amenable number.

815525 is a deficient number, since it is larger than the sum of its proper divisors (195757).

815525 is a wasteful number, since it uses less digits than its factorization.

815525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32631 (or 32626 counting only the distinct ones).

The product of its digits is 2000, while the sum is 26.

The square root of 815525 is about 903.0642280591. The cubic root of 815525 is about 93.4284390531.

The spelling of 815525 in words is "eight hundred fifteen thousand, five hundred twenty-five".