215240525 has 6 divisors (see below), whose sum is σ = 266898282. Its totient is φ = 172192400.

The previous prime is 215240449. The next prime is 215240551. The reversal of 215240525 is 525042512.

It can be written as a sum of positive squares in 3 ways, for example, as 3334276 + 211906249 = 1826^2 + 14557^2 .

It is not a de Polignac number, because 215240525 - 2¹⁸ = 214978381 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215240494 and 215240503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4304786 + ... + 4304835.

It is an arithmetic number, because the mean of its divisors is an integer number (44483047).

Almost surely, 2^215240525 is an apocalyptic number.

215240525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215240525 is a deficient number, since it is larger than the sum of its proper divisors (51657757).

215240525 is an equidigital number, since it uses as much as digits as its factorization.

215240525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8609631 (or 8609626 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 215240525 is about 14671.0778404315. The cubic root of 215240525 is about 599.2959566020.

The spelling of 215240525 in words is "two hundred fifteen million, two hundred forty thousand, five hundred twenty-five".