91841489 has 2 divisors, whose sum is σ = 91841490. Its totient is φ = 91841488.

The previous prime is 91841479. The next prime is 91841509. The reversal of 91841489 is 98414819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57501889 + 34339600 = 7583^2 + 5860^2 .

It is a cyclic number.

It is not a de Polignac number, because 91841489 - 2⁴ = 91841473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91841479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45920744 + 45920745.

It is an arithmetic number, because the mean of its divisors is an integer number (45920745).

Almost surely, 2^91841489 is an apocalyptic number.

It is an amenable number.

91841489 is a deficient number, since it is larger than the sum of its proper divisors (1).

91841489 is an equidigital number, since it uses as much as digits as its factorization.

91841489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 44.

The square root of 91841489 is about 9583.3965273279. The cubic root of 91841489 is about 451.1763280869.

The spelling of 91841489 in words is "ninety-one million, eight hundred forty-one thousand, four hundred eighty-nine".