91734989 has 2 divisors, whose sum is σ = 91734990. Its totient is φ = 91734988.

The previous prime is 91734961. The next prime is 91734991. The reversal of 91734989 is 98943719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69172489 + 22562500 = 8317^2 + 4750^2 .

It is a cyclic number.

It is not a de Polignac number, because 91734989 - 2²⁰ = 90686413 is a prime.

Together with 91734991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91734919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45867494 + 45867495.

It is an arithmetic number, because the mean of its divisors is an integer number (45867495).

Almost surely, 2^91734989 is an apocalyptic number.

It is an amenable number.

91734989 is a deficient number, since it is larger than the sum of its proper divisors (1).

91734989 is an equidigital number, since it uses as much as digits as its factorization.

91734989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 91734989 is about 9577.8384304602. The cubic root of 91734989 is about 451.0018649454.

The spelling of 91734989 in words is "ninety-one million, seven hundred thirty-four thousand, nine hundred eighty-nine".