215915530 has 8 divisors (see below), whose sum is σ = 388647972. Its totient is φ = 86366208.

The previous prime is 215915519. The next prime is 215915533. The reversal of 215915530 is 35519512.

215915530 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 2 ways, for example, as 192904321 + 23011209 = 13889^2 + 4797^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 215915492 and 215915501.

It is not an unprimeable number, because it can be changed into a prime (215915533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10795767 + ... + 10795786.

Almost surely, 2^215915530 is an apocalyptic number.

215915530 is a deficient number, since it is larger than the sum of its proper divisors (172732442).

215915530 is a wasteful number, since it uses less digits than its factorization.

215915530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21591560.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 215915530 is about 14694.0644479327. The cubic root of 215915530 is about 599.9217768394.

It can be divided in two parts, 2159 and 15530, that added together give a square (17689 = 133²).

The spelling of 215915530 in words is "two hundred fifteen million, nine hundred fifteen thousand, five hundred thirty".