216526091 has 2 divisors, whose sum is σ = 216526092. Its totient is φ = 216526090.

The previous prime is 216526069. The next prime is 216526099. The reversal of 216526091 is 190625612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216526091 - 2²⁶ = 149417227 is a prime.

It is not a weakly prime, because it can be changed into another prime (216526099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108263045 + 108263046.

It is an arithmetic number, because the mean of its divisors is an integer number (108263046).

Almost surely, 2^216526091 is an apocalyptic number.

216526091 is a deficient number, since it is larger than the sum of its proper divisors (1).

216526091 is an equidigital number, since it uses as much as digits as its factorization.

216526091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 216526091 is about 14714.8255511236. The cubic root of 216526091 is about 600.4867263520.

The spelling of 216526091 in words is "two hundred sixteen million, five hundred twenty-six thousand, ninety-one".