91745140809 has 16 divisors (see below), whose sum is σ = 140610229632. Its totient is φ = 52122753408.

The previous prime is 91745140789. The next prime is 91745140901. The reversal of 91745140809 is 90804154719.

It is not a de Polignac number, because 91745140809 - 2⁷ = 91745140681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91745140009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12623004 + ... + 12630269.

It is an arithmetic number, because the mean of its divisors is an integer number (8788139352).

Almost surely, 2^91745140809 is an apocalyptic number.

It is an amenable number.

91745140809 is a deficient number, since it is larger than the sum of its proper divisors (48865088823).

91745140809 is a wasteful number, since it uses less digits than its factorization.

91745140809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25253456.

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 91745140809 in words is "ninety-one billion, seven hundred forty-five million, one hundred forty thousand, eight hundred nine".