215525 has 12 divisors (see below), whose sum is σ = 275652. Its totient is φ = 167040.

The previous prime is 215521. The next prime is 215531. The reversal of 215525 is 525512.

It can be written as a sum of positive squares in 6 ways, for example, as 1156 + 214369 = 34^2 + 463^2 .

It is not a de Polignac number, because 215525 - 2² = 215521 is a prime.

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 = 215497 and 215506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215521) 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, 809 + ... + 1041.

It is an arithmetic number, because the mean of its divisors is an integer number (22971).

2²¹⁵⁵²⁵ is an apocalyptic number.

215525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215525 is a deficient number, since it is larger than the sum of its proper divisors (60127).

215525 is a wasteful number, since it uses less digits than its factorization.

215525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 275 counting only the distinct ones).

The product of its digits is 500, while the sum is 20.

The square root of 215525 is about 464.2467016576. The cubic root of 215525 is about 59.9559862396.

The spelling of 215525 in words is "two hundred fifteen thousand, five hundred twenty-five".