215451225 has 48 divisors (see below), whose sum is σ = 431787840. Its totient is φ = 104457600.

The previous prime is 215451211. The next prime is 215451239. The reversal of 215451225 is 522154512.

It is an interprime number because it is at equal distance from previous prime (215451211) and next prime (215451239).

It is not a de Polignac number, because 215451225 - 2⁶ = 215451161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7084 + ... + 21933.

It is an arithmetic number, because the mean of its divisors is an integer number (8995580).

Almost surely, 2^215451225 is an apocalyptic number.

215451225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215451225 is an abundant number, since it is smaller than the sum of its proper divisors (216336615).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215451225 is a wasteful number, since it uses less digits than its factorization.

215451225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29047 (or 29036 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 215451225 is about 14678.2568787987. The cubic root of 215451225 is about 599.4914440732.

The spelling of 215451225 in words is "two hundred fifteen million, four hundred fifty-one thousand, two hundred twenty-five".