91330789 has 4 divisors (see below), whose sum is σ = 99633600. Its totient is φ = 83027980.

The previous prime is 91330787. The next prime is 91330859. The reversal of 91330789 is 98703319.

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.

It is a cyclic number.

It is not a de Polignac number, because 91330789 - 2¹ = 91330787 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91330787) 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, 4151389 + ... + 4151410.

It is an arithmetic number, because the mean of its divisors is an integer number (24908400).

Almost surely, 2^91330789 is an apocalyptic number.

It is an amenable number.

91330789 is a deficient number, since it is larger than the sum of its proper divisors (8302811).

91330789 is a wasteful number, since it uses less digits than its factorization.

91330789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8302810.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 91330789 is about 9556.7143412367. The cubic root of 91330789 is about 450.3384926451.

The spelling of 91330789 in words is "ninety-one million, three hundred thirty thousand, seven hundred eighty-nine".