91819100001 has 16 divisors (see below), whose sum is σ = 125283029696. Its totient is φ = 59784189696.

The previous prime is 91819099979. The next prime is 91819100029. The reversal of 91819100001 is 10000191819.

It is a happy number.

It is not a de Polignac number, because 91819100001 - 2¹⁰ = 91819098977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91819100071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2124261 + ... + 2167053.

It is an arithmetic number, because the mean of its divisors is an integer number (7830189356).

Almost surely, 2^91819100001 is an apocalyptic number.

It is an amenable number.

91819100001 is a deficient number, since it is larger than the sum of its proper divisors (33463929695).

91819100001 is a wasteful number, since it uses less digits than its factorization.

91819100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59472.

The product of its (nonzero) digits is 648, while the sum is 30.

It can be divided in two parts, 91819 and 100001, that multiplied together give a palindrome (9181991819).

The spelling of 91819100001 in words is "ninety-one billion, eight hundred nineteen million, one hundred thousand, one".