19319008105 has 4 divisors (see below), whose sum is σ = 23182809732. Its totient is φ = 15455206480.

The previous prime is 19319008103. The next prime is 19319008109. The reversal of 19319008105 is 50180091391.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50180091391 = 29 ⋅1730347979.

It can be written as a sum of positive squares in 2 ways, for example, as 6310236969 + 13008771136 = 79437^2 + 114056^2 .

It is not a de Polignac number, because 19319008105 - 2¹ = 19319008103 is a prime.

It is a super-2 number, since 2×19319008105² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19319008103) 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, 1931900806 + ... + 1931900815.

It is an arithmetic number, because the mean of its divisors is an integer number (5795702433).

Almost surely, 2^19319008105 is an apocalyptic number.

It is an amenable number.

19319008105 is a deficient number, since it is larger than the sum of its proper divisors (3863801627).

19319008105 is an equidigital number, since it uses as much as digits as its factorization.

19319008105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3863801626.

The product of its (nonzero) digits is 9720, while the sum is 37.

Adding to 19319008105 its reverse (50180091391), we get a palindrome (69499099496).

The spelling of 19319008105 in words is "nineteen billion, three hundred nineteen million, eight thousand, one hundred five".