215985225 has 12 divisors (see below), whose sum is σ = 357095696. Its totient is φ = 115192080.

The previous prime is 215985223. The next prime is 215985233. The reversal of 215985225 is 522589512.

It is not a de Polignac number, because 215985225 - 2¹ = 215985223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215985223) 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, 1439827 + ... + 1439976.

Almost surely, 2^215985225 is an apocalyptic number.

215985225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215985225 is a deficient number, since it is larger than the sum of its proper divisors (141110471).

215985225 is a wasteful number, since it uses less digits than its factorization.

215985225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879816 (or 2879811 counting only the distinct ones).

The product of its digits is 72000, while the sum is 39.

The square root of 215985225 is about 14696.4357923954. The cubic root of 215985225 is about 599.9863191325.

The spelling of 215985225 in words is "two hundred fifteen million, nine hundred eighty-five thousand, two hundred twenty-five".