215520625 has 20 divisors (see below), whose sum is σ = 273777988. Its totient is φ = 169560000.

The previous prime is 215520607. The next prime is 215520637. The reversal of 215520625 is 526025512.

215520625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 10 ways, for example, as 190108944 + 25411681 = 13788^2 + 5041^2 .

It is not a de Polignac number, because 215520625 - 2¹⁹ = 214996337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215520593 and 215520602.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35299 + ... + 40951.

Almost surely, 2^215520625 is an apocalyptic number.

215520625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215520625 is a deficient number, since it is larger than the sum of its proper divisors (58257363).

215520625 is an frugal number, since it uses more digits than its factorization.

215520625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5734 (or 5719 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 215520625 is about 14680.6207293833. The cubic root of 215520625 is about 599.5558054925. Note that the first 3 decimals are identical.

The spelling of 215520625 in words is "two hundred fifteen million, five hundred twenty thousand, six hundred twenty-five".