215631065 has 16 divisors (see below), whose sum is σ = 284594688. Its totient is φ = 155845056.

The previous prime is 215631041. The next prime is 215631067. The reversal of 215631065 is 560136512.

215631065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 215631065 - 2²⁴ = 198853849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215631067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32237 + ... + 38346.

It is an arithmetic number, because the mean of its divisors is an integer number (17787168).

Almost surely, 2^215631065 is an apocalyptic number.

It is an amenable number.

215631065 is a deficient number, since it is larger than the sum of its proper divisors (68963623).

215631065 is a wasteful number, since it uses less digits than its factorization.

215631065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70648.

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

The square root of 215631065 is about 14684.3816689706. The cubic root of 215631065 is about 599.6581988421.

Adding to 215631065 its reverse (560136512), we get a palindrome (775767577).

The spelling of 215631065 in words is "two hundred fifteen million, six hundred thirty-one thousand, sixty-five".