91083789 has 6 divisors (see below), whose sum is σ = 131565486. Its totient is φ = 60722520.

The previous prime is 91083767. The next prime is 91083793. The reversal of 91083789 is 98738019.

It can be written as a sum of positive squares in only one way, i.e., 55621764 + 35462025 = 7458^2 + 5955^2 .

It is not a de Polignac number, because 91083789 - 2⁹ = 91083277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91083709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5060202 + ... + 5060219.

It is an arithmetic number, because the mean of its divisors is an integer number (21927581).

Almost surely, 2^91083789 is an apocalyptic number.

It is an amenable number.

91083789 is a deficient number, since it is larger than the sum of its proper divisors (40481697).

91083789 is a wasteful number, since it uses less digits than its factorization.

91083789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10120427 (or 10120424 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 91083789 is about 9543.7827406118. The cubic root of 91083789 is about 449.9321527340.

The spelling of 91083789 in words is "ninety-one million, eighty-three thousand, seven hundred eighty-nine".