215051189 has 2 divisors, whose sum is σ = 215051190. Its totient is φ = 215051188.

The previous prime is 215051167. The next prime is 215051201. The reversal of 215051189 is 981150512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152720164 + 62331025 = 12358^2 + 7895^2 .

It is a cyclic number.

It is not a de Polignac number, because 215051189 - 2⁸ = 215050933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215051129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107525594 + 107525595.

It is an arithmetic number, because the mean of its divisors is an integer number (107525595).

Almost surely, 2^215051189 is an apocalyptic number.

It is an amenable number.

215051189 is a deficient number, since it is larger than the sum of its proper divisors (1).

215051189 is an equidigital number, since it uses as much as digits as its factorization.

215051189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 32.

The square root of 215051189 is about 14664.6237251421. The cubic root of 215051189 is about 599.1201817934.

The spelling of 215051189 in words is "two hundred fifteen million, fifty-one thousand, one hundred eighty-nine".