91380089 has 2 divisors, whose sum is σ = 91380090. Its totient is φ = 91380088.

The previous prime is 91380077. The next prime is 91380097. The reversal of 91380089 is 98008319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60964864 + 30415225 = 7808^2 + 5515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91380089 is a prime.

It is not a weakly prime, because it can be changed into another prime (91380019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45690044 + 45690045.

It is an arithmetic number, because the mean of its divisors is an integer number (45690045).

Almost surely, 2^91380089 is an apocalyptic number.

It is an amenable number.

91380089 is a deficient number, since it is larger than the sum of its proper divisors (1).

91380089 is an equidigital number, since it uses as much as digits as its factorization.

91380089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 91380089 is about 9559.2933316224. The cubic root of 91380089 is about 450.4195083841.

The spelling of 91380089 in words is "ninety-one million, three hundred eighty thousand, eighty-nine".