215312565 has 32 divisors (see below), whose sum is σ = 392829696. Its totient is φ = 99763200.

The previous prime is 215312563. The next prime is 215312609. The reversal of 215312565 is 565213512.

It is a happy number.

It is not a de Polignac number, because 215312565 - 2¹ = 215312563 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215312563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29161 + ... + 35790.

It is an arithmetic number, because the mean of its divisors is an integer number (12275928).

Almost surely, 2^215312565 is an apocalyptic number.

It is an amenable number.

215312565 is a deficient number, since it is larger than the sum of its proper divisors (177517131).

215312565 is a wasteful number, since it uses less digits than its factorization.

215312565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64989.

The product of its digits is 9000, while the sum is 30.

The square root of 215312565 is about 14673.5328057016. The cubic root of 215312565 is about 599.3628096648.

The spelling of 215312565 in words is "two hundred fifteen million, three hundred twelve thousand, five hundred sixty-five".