91107939 has 8 divisors (see below), whose sum is σ = 130821712. Its totient is φ = 56066400.

The previous prime is 91107931. The next prime is 91107941. The reversal of 91107939 is 93970119.

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

It is not a de Polignac number, because 91107939 - 2³ = 91107931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2336101 = 91107939 / (9 + 1 + 1 + 0 + 7 + 9 + 3 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91107897 and 91107906.

It is not an unprimeable number, because it can be changed into a prime (91107931) 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, 1168012 + ... + 1168089.

It is an arithmetic number, because the mean of its divisors is an integer number (16352714).

Almost surely, 2^91107939 is an apocalyptic number.

91107939 is a deficient number, since it is larger than the sum of its proper divisors (39713773).

91107939 is a wasteful number, since it uses less digits than its factorization.

91107939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2336117.

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 91107939 is about 9545.0478783503. The cubic root of 91107939 is about 449.9719142965.

The spelling of 91107939 in words is "ninety-one million, one hundred seven thousand, nine hundred thirty-nine".