91919100001 has 4 divisors (see below), whose sum is σ = 91969523712. Its totient is φ = 91868676292.

The previous prime is 91919099983. The next prime is 91919100131. The reversal of 91919100001 is 10000191919.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91919100001 - 2¹⁹ = 91918575713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91919109001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25209121 + ... + 25212766.

It is an arithmetic number, because the mean of its divisors is an integer number (22992380928).

Almost surely, 2^91919100001 is an apocalyptic number.

It is an amenable number.

91919100001 is a deficient number, since it is larger than the sum of its proper divisors (50423711).

91919100001 is a wasteful number, since it uses less digits than its factorization.

91919100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50423710.

The product of its (nonzero) digits is 729, while the sum is 31.

It can be divided in two parts, 91919 and 100001, that multiplied together give a palindrome (9191991919).

The spelling of 91919100001 in words is "ninety-one billion, nine hundred nineteen million, one hundred thousand, one".