91850008489 has 2 divisors, whose sum is σ = 91850008490. Its totient is φ = 91850008488.

The previous prime is 91850008477. The next prime is 91850008511. The reversal of 91850008489 is 98480005819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87613040025 + 4236968464 = 295995^2 + 65092^2 .

It is a cyclic number.

It is not a de Polignac number, because 91850008489 - 2¹¹ = 91850006441 is a prime.

It is not a weakly prime, because it can be changed into another prime (91850108489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45925004244 + 45925004245.

It is an arithmetic number, because the mean of its divisors is an integer number (45925004245).

Almost surely, 2^91850008489 is an apocalyptic number.

It is an amenable number.

91850008489 is a deficient number, since it is larger than the sum of its proper divisors (1).

91850008489 is an equidigital number, since it uses as much as digits as its factorization.

91850008489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 52.

The spelling of 91850008489 in words is "ninety-one billion, eight hundred fifty million, eight thousand, four hundred eighty-nine".