91819101009 has 4 divisors (see below), whose sum is σ = 122425468016. Its totient is φ = 61212734004.

The previous prime is 91819101001. The next prime is 91819101019. The reversal of 91819101009 is 90010191819.

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 not a de Polignac number, because 91819101009 - 2³ = 91819101001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91819101001) 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, 15303183499 + ... + 15303183504.

It is an arithmetic number, because the mean of its divisors is an integer number (30606367004).

Almost surely, 2^91819101009 is an apocalyptic number.

It is an amenable number.

91819101009 is a deficient number, since it is larger than the sum of its proper divisors (30606367007).

91819101009 is a wasteful number, since it uses less digits than its factorization.

91819101009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30606367006.

The product of its (nonzero) digits is 5832, while the sum is 39.

The spelling of 91819101009 in words is "ninety-one billion, eight hundred nineteen million, one hundred one thousand, nine".