215715893 has 2 divisors, whose sum is σ = 215715894. Its totient is φ = 215715892.

The previous prime is 215715889. The next prime is 215715961. The reversal of 215715893 is 398517512.

215715893 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., 190384804 + 25331089 = 13798^2 + 5033^2 .

It is a cyclic number.

It is not a de Polignac number, because 215715893 - 2² = 215715889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 215715893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215715823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107857946 + 107857947.

It is an arithmetic number, because the mean of its divisors is an integer number (107857947).

Almost surely, 2^215715893 is an apocalyptic number.

It is an amenable number.

215715893 is a deficient number, since it is larger than the sum of its proper divisors (1).

215715893 is an equidigital number, since it uses as much as digits as its factorization.

215715893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 41.

The square root of 215715893 is about 14687.2697598975. The cubic root of 215715893 is about 599.7368225426.

The spelling of 215715893 in words is "two hundred fifteen million, seven hundred fifteen thousand, eight hundred ninety-three".