91619089 has 2 divisors, whose sum is σ = 91619090. Its totient is φ = 91619088.

The previous prime is 91619063. The next prime is 91619113. The reversal of 91619089 is 98091619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70274689 + 21344400 = 8383^2 + 4620^2 .

It is a cyclic number.

It is not a de Polignac number, because 91619089 - 2²³ = 83230481 is a prime.

It is not a weakly prime, because it can be changed into another prime (91619009) 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, 45809544 + 45809545.

It is an arithmetic number, because the mean of its divisors is an integer number (45809545).

Almost surely, 2^91619089 is an apocalyptic number.

It is an amenable number.

91619089 is a deficient number, since it is larger than the sum of its proper divisors (1).

91619089 is an equidigital number, since it uses as much as digits as its factorization.

91619089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 91619089 is about 9571.7860924699. The cubic root of 91619089 is about 450.8118496791.

The spelling of 91619089 in words is "ninety-one million, six hundred nineteen thousand, eighty-nine".