91337861 has 2 divisors, whose sum is σ = 91337862. Its totient is φ = 91337860.

The previous prime is 91337843. The next prime is 91337887. The reversal of 91337861 is 16873319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90820900 + 516961 = 9530^2 + 719^2 .

It is a cyclic number.

It is not a de Polignac number, because 91337861 - 2⁶ = 91337797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91333861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45668930 + 45668931.

It is an arithmetic number, because the mean of its divisors is an integer number (45668931).

Almost surely, 2^91337861 is an apocalyptic number.

It is an amenable number.

91337861 is a deficient number, since it is larger than the sum of its proper divisors (1).

91337861 is an equidigital number, since it uses as much as digits as its factorization.

91337861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 91337861 is about 9557.0843357166. The cubic root of 91337861 is about 450.3501160040.

The spelling of 91337861 in words is "ninety-one million, three hundred thirty-seven thousand, eight hundred sixty-one".