91481125839 has 4 divisors (see below), whose sum is σ = 121974834456. Its totient is φ = 60987417224.

The previous prime is 91481125823. The next prime is 91481125847. The reversal of 91481125839 is 93852118419.

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

It is a cyclic number.

It is not a de Polignac number, because 91481125839 - 2⁴ = 91481125823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91481125791 and 91481125800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91481121839) 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, 15246854304 + ... + 15246854309.

It is an arithmetic number, because the mean of its divisors is an integer number (30493708614).

Almost surely, 2^91481125839 is an apocalyptic number.

91481125839 is a deficient number, since it is larger than the sum of its proper divisors (30493708617).

91481125839 is a wasteful number, since it uses less digits than its factorization.

91481125839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30493708616.

The product of its digits is 622080, while the sum is 51.

The spelling of 91481125839 in words is "ninety-one billion, four hundred eighty-one million, one hundred twenty-five thousand, eight hundred thirty-nine".