91999260091 has 8 divisors (see below), whose sum is σ = 95741543520. Its totient is φ = 88294969728.

The previous prime is 91999260079. The next prime is 91999260103. The reversal of 91999260091 is 19006299919.

It is an interprime number because it is at equal distance from previous prime (91999260079) and next prime (91999260103).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91999260091 - 2⁹ = 91999259579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91999260191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9493326 + ... + 9503011.

It is an arithmetic number, because the mean of its divisors is an integer number (11967692940).

Almost surely, 2^91999260091 is an apocalyptic number.

91999260091 is a deficient number, since it is larger than the sum of its proper divisors (3742283429).

91999260091 is a wasteful number, since it uses less digits than its factorization.

91999260091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18996533.

The product of its (nonzero) digits is 708588, while the sum is 55.

The spelling of 91999260091 in words is "ninety-one billion, nine hundred ninety-nine million, two hundred sixty thousand, ninety-one".