104919991 has 4 divisors (see below), whose sum is σ = 114458184. Its totient is φ = 95381800.

The previous prime is 104919973. The next prime is 104920001. The reversal of 104919991 is 199919401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199919401 = 11 ⋅18174491.

It is a cyclic number.

It is not a de Polignac number, because 104919991 - 2⁵ = 104919959 is a prime.

It is a super-2 number, since 2×104919991² = 22016409022880162, which 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 (104919091) 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, 4769080 + ... + 4769101.

It is an arithmetic number, because the mean of its divisors is an integer number (28614546).

Almost surely, 2^104919991 is an apocalyptic number.

104919991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

104919991 is a deficient number, since it is larger than the sum of its proper divisors (9538193).

104919991 is an equidigital number, since it uses as much as digits as its factorization.

104919991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9538192.

The product of its (nonzero) digits is 26244, while the sum is 43.

The square root of 104919991 is about 10243.0459825191. The cubic root of 104919991 is about 471.6495396534.

The spelling of 104919991 in words is "one hundred four million, nine hundred nineteen thousand, nine hundred ninety-one".