215135243 has 2 divisors, whose sum is σ = 215135244. Its totient is φ = 215135242.

The previous prime is 215135209. The next prime is 215135251. The reversal of 215135243 is 342531512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215135243 - 2⁸ = 215134987 is a prime.

It is not a weakly prime, because it can be changed into another prime (215135203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107567621 + 107567622.

It is an arithmetic number, because the mean of its divisors is an integer number (107567622).

Almost surely, 2^215135243 is an apocalyptic number.

215135243 is a deficient number, since it is larger than the sum of its proper divisors (1).

215135243 is an equidigital number, since it uses as much as digits as its factorization.

215135243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 26.

The square root of 215135243 is about 14667.4893216256. The cubic root of 215135243 is about 599.1982281545.

Adding to 215135243 its reverse (342531512), we get a palindrome (557666755).

The spelling of 215135243 in words is "two hundred fifteen million, one hundred thirty-five thousand, two hundred forty-three".