91798809 has 8 divisors (see below), whose sum is σ = 124708032. Its totient is φ = 60044400.

The previous prime is 91798807. The next prime is 91798841. The reversal of 91798809 is 90889719.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91798809 - 2¹ = 91798807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91798801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288517 + ... + 288834.

It is an arithmetic number, because the mean of its divisors is an integer number (15588504).

Almost surely, 2^91798809 is an apocalyptic number.

It is an amenable number.

91798809 is a deficient number, since it is larger than the sum of its proper divisors (32909223).

91798809 is a wasteful number, since it uses less digits than its factorization.

91798809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577407.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 91798809 is about 9581.1695006403. The cubic root of 91798809 is about 451.1064279813.

The spelling of 91798809 in words is "ninety-one million, seven hundred ninety-eight thousand, eight hundred nine".