91798389 has 6 divisors (see below), whose sum is σ = 132597686. Its totient is φ = 61198920.

The previous prime is 91798373. The next prime is 91798417. The reversal of 91798389 is 98389719.

It can be written as a sum of positive squares in only one way, i.e., 60326289 + 31472100 = 7767^2 + 5610^2 .

It is not a de Polignac number, because 91798389 - 2⁴ = 91798373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91798489) 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 in 5 ways as a sum of consecutive naturals, for example, 5099902 + ... + 5099919.

Almost surely, 2^91798389 is an apocalyptic number.

It is an amenable number.

91798389 is a deficient number, since it is larger than the sum of its proper divisors (40799297).

91798389 is a wasteful number, since it uses less digits than its factorization.

91798389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10199827 (or 10199824 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 91798389 is about 9581.1475826229. The cubic root of 91798389 is about 451.1057400095.

The spelling of 91798389 in words is "ninety-one million, seven hundred ninety-eight thousand, three hundred eighty-nine".