215135855 has 16 divisors (see below), whose sum is σ = 282554784. Its totient is φ = 155950080.

The previous prime is 215135849. The next prime is 215135863. The reversal of 215135855 is 558531512.

It is not a de Polignac number, because 215135855 - 2²⁴ = 198358639 is a prime.

It is a super-2 number, since 2×215135855² = 92566872213162050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10967 + ... + 23463.

It is an arithmetic number, because the mean of its divisors is an integer number (17659674).

Almost surely, 2^215135855 is an apocalyptic number.

215135855 is a deficient number, since it is larger than the sum of its proper divisors (67418929).

215135855 is a wasteful number, since it uses less digits than its factorization.

215135855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12826.

The product of its digits is 30000, while the sum is 35.

The square root of 215135855 is about 14667.5101840769. The cubic root of 215135855 is about 599.1987963381.

The spelling of 215135855 in words is "two hundred fifteen million, one hundred thirty-five thousand, eight hundred fifty-five".