215111089 has 2 divisors, whose sum is σ = 215111090. Its totient is φ = 215111088.

The previous prime is 215111063. The next prime is 215111101. The reversal of 215111089 is 980111512.

215111089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190440000 + 24671089 = 13800^2 + 4967^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215111089 is a prime.

It is a super-2 number, since 2×215111089² = 92545561221531842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215111389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107555544 + 107555545.

It is an arithmetic number, because the mean of its divisors is an integer number (107555545).

Almost surely, 2^215111089 is an apocalyptic number.

It is an amenable number.

215111089 is a deficient number, since it is larger than the sum of its proper divisors (1).

215111089 is an equidigital number, since it uses as much as digits as its factorization.

215111089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 28.

The square root of 215111089 is about 14666.6659128788. The cubic root of 215111089 is about 599.1758026088.

The spelling of 215111089 in words is "two hundred fifteen million, one hundred eleven thousand, eighty-nine".