215540025 has 48 divisors (see below), whose sum is σ = 382796928. Its totient is φ = 106624000.

The previous prime is 215540021. The next prime is 215540033. The reversal of 215540025 is 520045512.

It is a happy number.

215540025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215540025 - 2² = 215540021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215539977 and 215540004.

It is not an unprimeable number, because it can be changed into a prime (215540021) 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, 89335 + ... + 91715.

It is an arithmetic number, because the mean of its divisors is an integer number (7974936).

Almost surely, 2^215540025 is an apocalyptic number.

215540025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215540025 is a deficient number, since it is larger than the sum of its proper divisors (167256903).

215540025 is a wasteful number, since it uses less digits than its factorization.

215540025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482 (or 2477 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 215540025 is about 14681.2814495193. The cubic root of 215540025 is about 599.5737945421.

Adding to 215540025 its reverse (520045512), we get a palindrome (735585537).

The spelling of 215540025 in words is "two hundred fifteen million, five hundred forty thousand, twenty-five".