215332231 has 6 divisors (see below), whose sum is σ = 222503496. Its totient is φ = 208385100.

The previous prime is 215332219. The next prime is 215332237. The reversal of 215332231 is 132233512.

It is a de Polignac number, because none of the positive numbers 2^k-215332231 is a prime.

It is a super-2 number, since 2×215332231² = 92735939414874722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215332237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111075 + ... + 112996.

It is an arithmetic number, because the mean of its divisors is an integer number (37083916).

Almost surely, 2^215332231 is an apocalyptic number.

215332231 is a deficient number, since it is larger than the sum of its proper divisors (7171265).

215332231 is an equidigital number, since it uses as much as digits as its factorization.

215332231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224133 (or 224102 counting only the distinct ones).

The product of its digits is 1080, while the sum is 22.

The square root of 215332231 is about 14674.2029085058. The cubic root of 215332231 is about 599.3810571061.

Adding to 215332231 its reverse (132233512), we get a palindrome (347565743).

The spelling of 215332231 in words is "two hundred fifteen million, three hundred thirty-two thousand, two hundred thirty-one".