91117253897999 has 4 divisors (see below), whose sum is σ = 104134004454864. Its totient is φ = 78100503341136.

The previous prime is 91117253897959. The next prime is 91117253898023. The reversal of 91117253897999 is 99979835271119.

It is a happy number.

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 91117253897999 - 2³⁶ = 91048534421263 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 (91117253897959) 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, 6508375278422 + ... + 6508375278435.

It is an arithmetic number, because the mean of its divisors is an integer number (26033501113716).

Almost surely, 2^{91117253897999} is an apocalyptic number.

91117253897999 is a deficient number, since it is larger than the sum of its proper divisors (13016750556865).

91117253897999 is a wasteful number, since it uses less digits than its factorization.

91117253897999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13016750556864.

The product of its digits is 694416240, while the sum is 80.

The spelling of 91117253897999 in words is "ninety-one trillion, one hundred seventeen billion, two hundred fifty-three million, eight hundred ninety-seven thousand, nine hundred ninety-nine".