215042897 has 2 divisors, whose sum is σ = 215042898. Its totient is φ = 215042896.

The previous prime is 215042851. The next prime is 215042899. The reversal of 215042897 is 798240512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158357056 + 56685841 = 12584^2 + 7529^2 .

It is a cyclic number.

It is not a de Polignac number, because 215042897 - 2¹⁶ = 214977361 is a prime.

Together with 215042899, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215042897.

It is not a weakly prime, because it can be changed into another prime (215042899) 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, 107521448 + 107521449.

It is an arithmetic number, because the mean of its divisors is an integer number (107521449).

Almost surely, 2^215042897 is an apocalyptic number.

It is an amenable number.

215042897 is a deficient number, since it is larger than the sum of its proper divisors (1).

215042897 is an equidigital number, since it uses as much as digits as its factorization.

215042897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 215042897 is about 14664.3410012179. The cubic root of 215042897 is about 599.1124813502.

The spelling of 215042897 in words is "two hundred fifteen million, forty-two thousand, eight hundred ninety-seven".