215352261 has 24 divisors (see below), whose sum is σ = 318898944. Its totient is φ = 139976160.

The previous prime is 215352229. The next prime is 215352307. The reversal of 215352261 is 162253512.

It is a happy number.

It is not a de Polignac number, because 215352261 - 2⁵ = 215352229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215352161) 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 23 ways as a sum of consecutive naturals, for example, 130735 + ... + 132371.

It is an arithmetic number, because the mean of its divisors is an integer number (13287456).

Almost surely, 2^215352261 is an apocalyptic number.

It is an amenable number.

215352261 is a deficient number, since it is larger than the sum of its proper divisors (103546683).

215352261 is a wasteful number, since it uses less digits than its factorization.

215352261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001 (or 1998 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 215352261 is about 14674.8853828573. The cubic root of 215352261 is about 599.3996411491.

The spelling of 215352261 in words is "two hundred fifteen million, three hundred fifty-two thousand, two hundred sixty-one".