215055231 has 4 divisors (see below), whose sum is σ = 286740312. Its totient is φ = 143370152.

The previous prime is 215055223. The next prime is 215055251. The reversal of 215055231 is 132550512.

It is a happy number.

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 215055231 - 2³ = 215055223 is a prime.

It is a super-2 number, since 2×215055231² = 92497504760926722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215055251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35842536 + ... + 35842541.

It is an arithmetic number, because the mean of its divisors is an integer number (71685078).

Almost surely, 2^215055231 is an apocalyptic number.

215055231 is a deficient number, since it is larger than the sum of its proper divisors (71685081).

215055231 is an equidigital number, since it uses as much as digits as its factorization.

215055231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71685080.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 215055231 is about 14664.7615391455. The cubic root of 215055231 is about 599.1239353627.

The spelling of 215055231 in words is "two hundred fifteen million, fifty-five thousand, two hundred thirty-one".