215150225 has 12 divisors (see below), whose sum is σ = 267079260. Its totient is φ = 171931200.

The previous prime is 215150213. The next prime is 215150263. The reversal of 215150225 is 522051512.

It is a Cunningham number, because it is equal to 14668²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 16875664 + 198274561 = 4108^2 + 14081^2 .

It is not a de Polignac number, because 215150225 - 2²⁴ = 198373009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215150225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21311 + ... + 29739.

It is an arithmetic number, because the mean of its divisors is an integer number (22256605).

Almost surely, 2^215150225 is an apocalyptic number.

215150225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215150225 is a deficient number, since it is larger than the sum of its proper divisors (51929035).

215150225 is a wasteful number, since it uses less digits than its factorization.

215150225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9460 (or 9455 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 215150225 is about 14668.0000340878. Note that the first 4 decimals coincide. The cubic root of 215150225 is about 599.2121372028.

The spelling of 215150225 in words is "two hundred fifteen million, one hundred fifty thousand, two hundred twenty-five".