91090589 has 2 divisors, whose sum is σ = 91090590. Its totient is φ = 91090588.

The previous prime is 91090583. The next prime is 91090613. The reversal of 91090589 is 98509019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66667225 + 24423364 = 8165^2 + 4942^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91090589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91090583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45545294 + 45545295.

It is an arithmetic number, because the mean of its divisors is an integer number (45545295).

Almost surely, 2^91090589 is an apocalyptic number.

It is an amenable number.

91090589 is a deficient number, since it is larger than the sum of its proper divisors (1).

91090589 is an equidigital number, since it uses as much as digits as its factorization.

91090589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 91090589 is about 9544.1389868338. The cubic root of 91090589 is about 449.9433492471.

The spelling of 91090589 in words is "ninety-one million, ninety thousand, five hundred eighty-nine".