215137056 has 24 divisors (see below), whose sum is σ = 564735024. Its totient is φ = 71712320.

The previous prime is 215137037. The next prime is 215137061. The reversal of 215137056 is 650731512.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1120410 + ... + 1120601.

It is an arithmetic number, because the mean of its divisors is an integer number (23530626).

Almost surely, 2^215137056 is an apocalyptic number.

It is an amenable number.

215137056 is an abundant number, since it is smaller than the sum of its proper divisors (349597968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215137056 is a wasteful number, since it uses less digits than its factorization.

215137056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241024 (or 2241016 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 215137056 is about 14667.5511248470. The cubic root of 215137056 is about 599.1999113489.

Adding to 215137056 its reverse (650731512), we get a palindrome (865868568).

The spelling of 215137056 in words is "two hundred fifteen million, one hundred thirty-seven thousand, fifty-six".