215552231 has 4 divisors (see below), whose sum is σ = 228231792. Its totient is φ = 202872672.

The previous prime is 215552221. The next prime is 215552263. The reversal of 215552231 is 132255512.

215552231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215552231 - 2⁶ = 215552167 is a prime.

It is a super-2 number, since 2×215552231² = 92925528578154722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215552231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215552221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6339755 + ... + 6339788.

It is an arithmetic number, because the mean of its divisors is an integer number (57057948).

Almost surely, 2^215552231 is an apocalyptic number.

215552231 is a deficient number, since it is larger than the sum of its proper divisors (12679561).

215552231 is a wasteful number, since it uses less digits than its factorization.

215552231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12679560.

The product of its digits is 3000, while the sum is 26.

The square root of 215552231 is about 14681.6971430417. The cubic root of 215552231 is about 599.5851122538.

The spelling of 215552231 in words is "two hundred fifteen million, five hundred fifty-two thousand, two hundred thirty-one".