91109939 has 8 divisors (see below), whose sum is σ = 92434320. Its totient is φ = 89794656.

The previous prime is 91109933. The next prime is 91109951. The reversal of 91109939 is 93990119.

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

It is a cyclic number.

It is not a de Polignac number, because 91109939 - 2²⁴ = 74332723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91109896 and 91109905.

It is not an unprimeable number, because it can be changed into a prime (91109933) 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, 19352 + ... + 23594.

It is an arithmetic number, because the mean of its divisors is an integer number (11554290).

Almost surely, 2^91109939 is an apocalyptic number.

91109939 is a deficient number, since it is larger than the sum of its proper divisors (1324381).

91109939 is a wasteful number, since it uses less digits than its factorization.

91109939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4549.

The product of its (nonzero) digits is 19683, while the sum is 41.

The square root of 91109939 is about 9545.1526441435. The cubic root of 91109939 is about 449.9752068645.

The spelling of 91109939 in words is "ninety-one million, one hundred nine thousand, nine hundred thirty-nine".