91159439 has 4 divisors (see below), whose sum is σ = 104182224. Its totient is φ = 78136656.

The previous prime is 91159433. The next prime is 91159451. The reversal of 91159439 is 93495119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93495119 = 2357 ⋅39667.

It is a cyclic number.

It is not a de Polignac number, because 91159439 - 2²⁴ = 74382223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91159396 and 91159405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91159433) 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 3 ways as a sum of consecutive naturals, for example, 6511382 + ... + 6511395.

It is an arithmetic number, because the mean of its divisors is an integer number (26045556).

Almost surely, 2^91159439 is an apocalyptic number.

91159439 is a deficient number, since it is larger than the sum of its proper divisors (13022785).

91159439 is a wasteful number, since it uses less digits than its factorization.

91159439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13022784.

The product of its digits is 43740, while the sum is 41.

The square root of 91159439 is about 9547.7452312051. The cubic root of 91159439 is about 450.0566825718.

The spelling of 91159439 in words is "ninety-one million, one hundred fifty-nine thousand, four hundred thirty-nine".