91000099000019 has 4 divisors (see below), whose sum is σ = 99272835272760. Its totient is φ = 82727362727280.

The previous prime is 91000099000007. The next prime is 91000099000043.

It is a happy number.

91000099000019 is nontrivially palindromic in base 10.

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 91000099000019 - 2¹⁶ = 91000098934483 is a prime.

It is a super-2 number, since 2×91000099000019² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91000099000219) 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, 4136368136354 + ... + 4136368136375.

It is an arithmetic number, because the mean of its divisors is an integer number (24818208818190).

Almost surely, 2^{91000099000019} is an apocalyptic number.

91000099000019 is a deficient number, since it is larger than the sum of its proper divisors (8272736272741).

91000099000019 is a wasteful number, since it uses less digits than its factorization.

91000099000019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8272736272740.

The product of its (nonzero) digits is 6561, while the sum is 38.

The spelling of 91000099000019 in words is "ninety-one trillion, ninety-nine million, nineteen", and thus it is an aban number and an uban number.