91988088919 has 4 divisors (see below), whose sum is σ = 92131596720. Its totient is φ = 91844581120.

The previous prime is 91988088893. The next prime is 91988088923.

91988088919 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 91988088919 - 2⁵ = 91988088887 is a prime.

It is a super-2 number, since 2×91988088919² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91988088989) 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, 71752939 + ... + 71754220.

It is an arithmetic number, because the mean of its divisors is an integer number (23032899180).

Almost surely, 2^91988088919 is an apocalyptic number.

91988088919 is a deficient number, since it is larger than the sum of its proper divisors (143507801).

91988088919 is a wasteful number, since it uses less digits than its factorization.

91988088919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143507800.

The product of its (nonzero) digits is 26873856, while the sum is 70.

The spelling of 91988088919 in words is "ninety-one billion, nine hundred eighty-eight million, eighty-eight thousand, nine hundred nineteen".