91907139 has 4 divisors (see below), whose sum is σ = 122542856. Its totient is φ = 61271424.

The previous prime is 91907131. The next prime is 91907143. The reversal of 91907139 is 93170919.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 91907139 - 2³ = 91907131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91907097 and 91907106.

It is not an unprimeable number, because it can be changed into a prime (91907131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15317854 + ... + 15317859.

It is an arithmetic number, because the mean of its divisors is an integer number (30635714).

Almost surely, 2^91907139 is an apocalyptic number.

91907139 is a deficient number, since it is larger than the sum of its proper divisors (30635717).

91907139 is a wasteful number, since it uses less digits than its factorization.

91907139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30635716.

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

The square root of 91907139 is about 9586.8211102534. The cubic root of 91907139 is about 451.2838055515.

The spelling of 91907139 in words is "ninety-one million, nine hundred seven thousand, one hundred thirty-nine".