91437089 has 2 divisors, whose sum is σ = 91437090. Its totient is φ = 91437088.

The previous prime is 91437077. The next prime is 91437091. The reversal of 91437089 is 98073419.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50694400 + 40742689 = 7120^2 + 6383^2 .

It is a cyclic number.

It is not a de Polignac number, because 91437089 - 2⁸ = 91436833 is a prime.

It is a Sophie Germain prime.

Together with 91437091, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (91437289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45718544 + 45718545.

It is an arithmetic number, because the mean of its divisors is an integer number (45718545).

Almost surely, 2^91437089 is an apocalyptic number.

It is an amenable number.

91437089 is a deficient number, since it is larger than the sum of its proper divisors (1).

91437089 is an equidigital number, since it uses as much as digits as its factorization.

91437089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 91437089 is about 9562.2742587734. The cubic root of 91437089 is about 450.5131413842.

The spelling of 91437089 in words is "ninety-one million, four hundred thirty-seven thousand, eighty-nine".