215630561 has 8 divisors (see below), whose sum is σ = 223056960. Its totient is φ = 208288368.

The previous prime is 215630537. The next prime is 215630641. The reversal of 215630561 is 165036512.

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

It is a cyclic number.

It is not a de Polignac number, because 215630561 - 2¹⁴ = 215614177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215630531) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15821 + ... + 26106.

It is an arithmetic number, because the mean of its divisors is an integer number (27882120).

Almost surely, 2^215630561 is an apocalyptic number.

It is an amenable number.

215630561 is a deficient number, since it is larger than the sum of its proper divisors (7426399).

215630561 is a wasteful number, since it uses less digits than its factorization.

215630561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42103.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 215630561 is about 14684.3645078703. The cubic root of 215630561 is about 599.6577316429.

The spelling of 215630561 in words is "two hundred fifteen million, six hundred thirty thousand, five hundred sixty-one".