91090839 has 16 divisors (see below), whose sum is σ = 139341312. Its totient is φ = 51850848.

The previous prime is 91090837. The next prime is 91090843. The reversal of 91090839 is 93809019.

It is not a de Polignac number, because 91090839 - 2¹ = 91090837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91090797 and 91090806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91090837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2724 + ... + 13769.

It is an arithmetic number, because the mean of its divisors is an integer number (8708832).

Almost surely, 2^91090839 is an apocalyptic number.

91090839 is a deficient number, since it is larger than the sum of its proper divisors (48250473).

91090839 is a wasteful number, since it uses less digits than its factorization.

91090839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16766.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 91090839 is about 9544.1520838679. The cubic root of 91090839 is about 449.9437608730.

The spelling of 91090839 in words is "ninety-one million, ninety thousand, eight hundred thirty-nine".