91913543 has 16 divisors (see below), whose sum is σ = 104841216. Its totient is φ = 80065920.

The previous prime is 91913533. The next prime is 91913551. The reversal of 91913543 is 34531919.

It is not a de Polignac number, because 91913543 - 2²⁰ = 90864967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91913533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8330 + ... + 15912.

It is an arithmetic number, because the mean of its divisors is an integer number (6552576).

Almost surely, 2^91913543 is an apocalyptic number.

91913543 is a deficient number, since it is larger than the sum of its proper divisors (12927673).

91913543 is a wasteful number, since it uses less digits than its factorization.

91913543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7654.

The product of its digits is 14580, while the sum is 35.

The square root of 91913543 is about 9587.1551046178. The cubic root of 91913543 is about 451.2942869802.

The spelling of 91913543 in words is "ninety-one million, nine hundred thirteen thousand, five hundred forty-three".