215336561 has 12 divisors (see below), whose sum is σ = 242202576. Its totient is φ = 191203320.

The previous prime is 215336549. The next prime is 215336567. The reversal of 215336561 is 165633512.

It is not a de Polignac number, because 215336561 - 2²² = 211142257 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (215336567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15491 + ... + 25896.

It is an arithmetic number, because the mean of its divisors is an integer number (20183548).

Almost surely, 2^215336561 is an apocalyptic number.

It is an amenable number.

215336561 is a deficient number, since it is larger than the sum of its proper divisors (26866015).

215336561 is a wasteful number, since it uses less digits than its factorization.

215336561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41452 (or 41441 counting only the distinct ones).

The product of its digits is 16200, while the sum is 32.

The square root of 215336561 is about 14674.3504455904. The cubic root of 215336561 is about 599.3850746229.

The spelling of 215336561 in words is "two hundred fifteen million, three hundred thirty-six thousand, five hundred sixty-one".