91670489 has 2 divisors, whose sum is σ = 91670490. Its totient is φ = 91670488.

The previous prime is 91670461. The next prime is 91670519. The reversal of 91670489 is 98407619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69889600 + 21780889 = 8360^2 + 4667^2 .

It is an emirp because it is prime and its reverse (98407619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91670489 - 2²⁰ = 90621913 is a prime.

It is not a weakly prime, because it can be changed into another prime (91670419) 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, 45835244 + 45835245.

It is an arithmetic number, because the mean of its divisors is an integer number (45835245).

Almost surely, 2^91670489 is an apocalyptic number.

It is an amenable number.

91670489 is a deficient number, since it is larger than the sum of its proper divisors (1).

91670489 is an equidigital number, since it uses as much as digits as its factorization.

91670489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 91670489 is about 9574.4706903306. The cubic root of 91670489 is about 450.8961385080.

The spelling of 91670489 in words is "ninety-one million, six hundred seventy thousand, four hundred eighty-nine".