91320211 has 2 divisors, whose sum is σ = 91320212. Its totient is φ = 91320210.

The previous prime is 91320197. The next prime is 91320301. The reversal of 91320211 is 11202319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91320211 - 2⁵ = 91320179 is a prime.

It is not a weakly prime, because it can be changed into another prime (91320011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45660105 + 45660106.

It is an arithmetic number, because the mean of its divisors is an integer number (45660106).

Almost surely, 2^91320211 is an apocalyptic number.

91320211 is a deficient number, since it is larger than the sum of its proper divisors (1).

91320211 is an equidigital number, since it uses as much as digits as its factorization.

91320211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 91320211 is about 9556.1608923249. The cubic root of 91320211 is about 450.3211057940.

The spelling of 91320211 in words is "ninety-one million, three hundred twenty thousand, two hundred eleven".