91266491 has 2 divisors, whose sum is σ = 91266492. Its totient is φ = 91266490.

The previous prime is 91266473. The next prime is 91266493. The reversal of 91266491 is 19466219.

It is a strong prime.

It is an emirp because it is prime and its reverse (19466219) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91266491 is a prime.

It is a Sophie Germain prime.

Together with 91266493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91266493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45633245 + 45633246.

It is an arithmetic number, because the mean of its divisors is an integer number (45633246).

Almost surely, 2^91266491 is an apocalyptic number.

91266491 is a deficient number, since it is larger than the sum of its proper divisors (1).

91266491 is an equidigital number, since it uses as much as digits as its factorization.

91266491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 91266491 is about 9553.3497266666. The cubic root of 91266491 is about 450.2327865538.

The spelling of 91266491 in words is "ninety-one million, two hundred sixty-six thousand, four hundred ninety-one".