19130271817 has 4 divisors (see below), whose sum is σ = 19130617476. Its totient is φ = 19129926160.

The previous prime is 19130271791. The next prime is 19130271859. The reversal of 19130271817 is 71817203191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16514563081 + 2615708736 = 128509^2 + 51144^2 .

It is a cyclic number.

It is not a de Polignac number, because 19130271817 - 2¹⁵ = 19130239049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19130271817.

It is not an unprimeable number, because it can be changed into a prime (19130271617) 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, 69034 + ... + 207427.

It is an arithmetic number, because the mean of its divisors is an integer number (4782654369).

Almost surely, 2^19130271817 is an apocalyptic number.

It is an amenable number.

19130271817 is a deficient number, since it is larger than the sum of its proper divisors (345659).

19130271817 is an equidigital number, since it uses as much as digits as its factorization.

19130271817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345658.

The product of its (nonzero) digits is 21168, while the sum is 40.

The spelling of 19130271817 in words is "nineteen billion, one hundred thirty million, two hundred seventy-one thousand, eight hundred seventeen".