215800231 has 2 divisors, whose sum is σ = 215800232. Its totient is φ = 215800230.

The previous prime is 215800219. The next prime is 215800253. The reversal of 215800231 is 132008512.

It is an a-pointer prime, because the next prime (215800253) can be obtained adding 215800231 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215800231 - 2⁵ = 215800199 is a prime.

It is a super-2 number, since 2×215800231² = 93139479399306722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215800631) by changing a digit.

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 as a sum of consecutive naturals, namely, 107900115 + 107900116.

It is an arithmetic number, because the mean of its divisors is an integer number (107900116).

Almost surely, 2^215800231 is an apocalyptic number.

215800231 is a deficient number, since it is larger than the sum of its proper divisors (1).

215800231 is an equidigital number, since it uses as much as digits as its factorization.

215800231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 215800231 is about 14690.1406051814. The cubic root of 215800231 is about 599.8149716504.

Adding to 215800231 its reverse (132008512), we get a palindrome (347808743).

The spelling of 215800231 in words is "two hundred fifteen million, eight hundred thousand, two hundred thirty-one".