215135849 has 2 divisors, whose sum is σ = 215135850. Its totient is φ = 215135848.

The previous prime is 215135831. The next prime is 215135863. The reversal of 215135849 is 948531512.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138485824 + 76650025 = 11768^2 + 8755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215135849 is a prime.

It is not a weakly prime, because it can be changed into another prime (215135819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107567924 + 107567925.

It is an arithmetic number, because the mean of its divisors is an integer number (107567925).

Almost surely, 2^215135849 is an apocalyptic number.

It is an amenable number.

215135849 is a deficient number, since it is larger than the sum of its proper divisors (1).

215135849 is an equidigital number, since it uses as much as digits as its factorization.

215135849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 38.

The square root of 215135849 is about 14667.5099795432. The cubic root of 215135849 is about 599.1987907677.

The spelling of 215135849 in words is "two hundred fifteen million, one hundred thirty-five thousand, eight hundred forty-nine".