91137589 has 2 divisors, whose sum is σ = 91137590. Its totient is φ = 91137588.

The previous prime is 91137587. The next prime is 91137601. The reversal of 91137589 is 98573119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82047364 + 9090225 = 9058^2 + 3015^2 .

It is a cyclic number.

It is not a de Polignac number, because 91137589 - 2¹ = 91137587 is a prime.

Together with 91137587, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91137583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45568794 + 45568795.

It is an arithmetic number, because the mean of its divisors is an integer number (45568795).

Almost surely, 2^91137589 is an apocalyptic number.

It is an amenable number.

91137589 is a deficient number, since it is larger than the sum of its proper divisors (1).

91137589 is an equidigital number, since it uses as much as digits as its factorization.

91137589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 91137589 is about 9546.6009134142. The cubic root of 91137589 is about 450.0207216795.

The spelling of 91137589 in words is "ninety-one million, one hundred thirty-seven thousand, five hundred eighty-nine".