215625 has 24 divisors (see below), whose sum is σ = 374976. Its totient is φ = 110000.

The previous prime is 215617. The next prime is 215653. The reversal of 215625 is 526512.

It is not a de Polignac number, because 215625 - 2³ = 215617 is a prime.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 215625.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9364 + ... + 9386.

It is an arithmetic number, because the mean of its divisors is an integer number (15624).

2²¹⁵⁶²⁵ is an apocalyptic number.

215625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215625 is a deficient number, since it is larger than the sum of its proper divisors (159351).

215625 is an frugal number, since it uses more digits than its factorization.

215625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51 (or 31 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 215625 is about 464.3543905252. The cubic root of 215625 is about 59.9652576645.

Adding to 215625 its product of digits (600), we get a square (216225 = 465²).

The spelling of 215625 in words is "two hundred fifteen thousand, six hundred twenty-five".