215135985 has 16 divisors (see below), whose sum is σ = 345563136. Its totient is φ = 114290688.

The previous prime is 215135981. The next prime is 215136011. The reversal of 215135985 is 589531512.

It is not a de Polignac number, because 215135985 - 2² = 215135981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215135981) 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, 24049 + ... + 31758.

It is an arithmetic number, because the mean of its divisors is an integer number (21597696).

Almost surely, 2^215135985 is an apocalyptic number.

It is an amenable number.

215135985 is a deficient number, since it is larger than the sum of its proper divisors (130427151).

215135985 is a wasteful number, since it uses less digits than its factorization.

215135985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56072.

The product of its digits is 54000, while the sum is 39.

The square root of 215135985 is about 14667.5146156396. The cubic root of 215135985 is about 599.1989170306.

The spelling of 215135985 in words is "two hundred fifteen million, one hundred thirty-five thousand, nine hundred eighty-five".