91223406819 has 10 divisors (see below), whose sum is σ = 136272002900. Its totient is φ = 60815604492.

The previous prime is 91223406751. The next prime is 91223406829. The reversal of 91223406819 is 91860432219.

91223406819 is a `hidden beast` number, since 9 + 1 + 223 + 406 + 8 + 19 = 666.

It is not a de Polignac number, because 91223406819 - 2⁷ = 91223406691 is a prime.

It is a super-2 number, since 2×91223406819² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91223406829) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 563107369 + ... + 563107530.

It is an arithmetic number, because the mean of its divisors is an integer number (13627200290).

Almost surely, 2^91223406819 is an apocalyptic number.

91223406819 is a deficient number, since it is larger than the sum of its proper divisors (45048596081).

91223406819 is a wasteful number, since it uses less digits than its factorization.

91223406819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126214911 (or 1126214902 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 91223406819 in words is "ninety-one billion, two hundred twenty-three million, four hundred six thousand, eight hundred nineteen".