91991910001 has 8 divisors (see below), whose sum is σ = 92071203840. Its totient is φ = 91912654752.

The previous prime is 91991909953. The next prime is 91991910011. The reversal of 91991910001 is 10001919919.

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 91991910001 - 2¹⁵ = 91991877233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91991910011) 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, 6492741 + ... + 6506893.

It is an arithmetic number, because the mean of its divisors is an integer number (11508900480).

Almost surely, 2^91991910001 is an apocalyptic number.

It is an amenable number.

91991910001 is a deficient number, since it is larger than the sum of its proper divisors (79293839).

91991910001 is a wasteful number, since it uses less digits than its factorization.

91991910001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19295.

The product of its (nonzero) digits is 6561, while the sum is 40.

The spelling of 91991910001 in words is "ninety-one billion, nine hundred ninety-one million, nine hundred ten thousand, one".