215158189 has 2 divisors, whose sum is σ = 215158190. Its totient is φ = 215158188.

The previous prime is 215158157. The next prime is 215158211. The reversal of 215158189 is 981851512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161722089 + 53436100 = 12717^2 + 7310^2 .

It is a cyclic number.

It is not a de Polignac number, because 215158189 - 2⁵ = 215158157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215158129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107579094 + 107579095.

It is an arithmetic number, because the mean of its divisors is an integer number (107579095).

Almost surely, 2^215158189 is an apocalyptic number.

It is an amenable number.

215158189 is a deficient number, since it is larger than the sum of its proper divisors (1).

215158189 is an equidigital number, since it uses as much as digits as its factorization.

215158189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 40.

The square root of 215158189 is about 14668.2715068954. The cubic root of 215158189 is about 599.2195305897.

It can be divided in two parts, 215 and 158189, that added together give a square (158404 = 398²).

The spelling of 215158189 in words is "two hundred fifteen million, one hundred fifty-eight thousand, one hundred eighty-nine".