91266839 has 2 divisors, whose sum is σ = 91266840. Its totient is φ = 91266838.

The previous prime is 91266803. The next prime is 91266841. The reversal of 91266839 is 93866219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91266839 - 2¹⁶ = 91201303 is a prime.

Together with 91266841, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91266839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91266859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45633419 + 45633420.

It is an arithmetic number, because the mean of its divisors is an integer number (45633420).

Almost surely, 2^91266839 is an apocalyptic number.

91266839 is a deficient number, since it is larger than the sum of its proper divisors (1).

91266839 is an equidigital number, since it uses as much as digits as its factorization.

91266839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 44.

The square root of 91266839 is about 9553.3679401560. The cubic root of 91266839 is about 450.2333588004.

The spelling of 91266839 in words is "ninety-one million, two hundred sixty-six thousand, eight hundred thirty-nine".