91143705599 has 4 divisors (see below), whose sum is σ = 96505100064. Its totient is φ = 85782311136.

The previous prime is 91143705593. The next prime is 91143705637. The reversal of 91143705599 is 99550734119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99550734119 = 1229 ⋅81001411.

It is a cyclic number.

It is not a de Polignac number, because 91143705599 - 2³⁶ = 22424228863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91143705599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91143705593) 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, 2680697207 + ... + 2680697240.

It is an arithmetic number, because the mean of its divisors is an integer number (24126275016).

Almost surely, 2^91143705599 is an apocalyptic number.

91143705599 is a deficient number, since it is larger than the sum of its proper divisors (5361394465).

91143705599 is a wasteful number, since it uses less digits than its factorization.

91143705599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5361394464.

The product of its (nonzero) digits is 1530900, while the sum is 53.

The spelling of 91143705599 in words is "ninety-one billion, one hundred forty-three million, seven hundred five thousand, five hundred ninety-nine".