91798121 has 4 divisors (see below), whose sum is σ = 91827600. Its totient is φ = 91768644.

The previous prime is 91798093. The next prime is 91798141. The reversal of 91798121 is 12189719.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12189719 = 1021 ⋅11939.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91798121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91798141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9431 + ... + 16508.

It is an arithmetic number, because the mean of its divisors is an integer number (22956900).

Almost surely, 2^91798121 is an apocalyptic number.

It is an amenable number.

91798121 is a deficient number, since it is larger than the sum of its proper divisors (29479).

91798121 is a wasteful number, since it uses less digits than its factorization.

91798121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29478.

The product of its digits is 9072, while the sum is 38.

The square root of 91798121 is about 9581.1335968141. The cubic root of 91798121 is about 451.1053010168.

It can be divided in two parts, 91798 and 121, that added together give a palindrome (91919).

The spelling of 91798121 in words is "ninety-one million, seven hundred ninety-eight thousand, one hundred twenty-one".