215606849 has 2 divisors, whose sum is σ = 215606850. Its totient is φ = 215606848.

The previous prime is 215606791. The next prime is 215606917. The reversal of 215606849 is 948606512.

It is a happy number.

215606849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130690624 + 84916225 = 11432^2 + 9215^2 .

It is a cyclic number.

It is not a de Polignac number, because 215606849 - 2⁸ = 215606593 is a prime.

It is not a weakly prime, because it can be changed into another prime (215606549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107803424 + 107803425.

It is an arithmetic number, because the mean of its divisors is an integer number (107803425).

Almost surely, 2^215606849 is an apocalyptic number.

It is an amenable number.

215606849 is a deficient number, since it is larger than the sum of its proper divisors (1).

215606849 is an equidigital number, since it uses as much as digits as its factorization.

215606849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 215606849 is about 14683.5570962897. The cubic root of 215606849 is about 599.6357502112.

The spelling of 215606849 in words is "two hundred fifteen million, six hundred six thousand, eight hundred forty-nine".