215561325 has 48 divisors (see below), whose sum is σ = 413116416. Its totient is φ = 97137600.

The previous prime is 215561323. The next prime is 215561351. The reversal of 215561325 is 523165512.

It is a happy number.

It is not a de Polignac number, because 215561325 - 2¹ = 215561323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215561292 and 215561301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215561323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34384 + ... + 40166.

It is an arithmetic number, because the mean of its divisors is an integer number (8606592).

Almost surely, 2^215561325 is an apocalyptic number.

215561325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215561325 is a deficient number, since it is larger than the sum of its proper divisors (197555091).

215561325 is a wasteful number, since it uses less digits than its factorization.

215561325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5874 (or 5869 counting only the distinct ones).

The product of its digits is 9000, while the sum is 30.

The square root of 215561325 is about 14682.0068451149. The cubic root of 215561325 is about 599.5935441627.

The spelling of 215561325 in words is "two hundred fifteen million, five hundred sixty-one thousand, three hundred twenty-five".