91866211 has 2 divisors, whose sum is σ = 91866212. Its totient is φ = 91866210.

The previous prime is 91866167. The next prime is 91866217. The reversal of 91866211 is 11266819.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91866211 - 2¹⁷ = 91735139 is a prime.

It is not a weakly prime, because it can be changed into another prime (91866217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45933105 + 45933106.

It is an arithmetic number, because the mean of its divisors is an integer number (45933106).

Almost surely, 2^91866211 is an apocalyptic number.

91866211 is a deficient number, since it is larger than the sum of its proper divisors (1).

91866211 is an equidigital number, since it uses as much as digits as its factorization.

91866211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 34.

The square root of 91866211 is about 9584.6862755126. The cubic root of 91866211 is about 451.2168071798.

The spelling of 91866211 in words is "ninety-one million, eight hundred sixty-six thousand, two hundred eleven".