19351417117 has 4 divisors (see below), whose sum is σ = 19568848860. Its totient is φ = 19133985376.

The previous prime is 19351417109. The next prime is 19351417121. The reversal of 19351417117 is 71171415391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71171415391 = 11779 ⋅6042229.

It can be written as a sum of positive squares in 2 ways, for example, as 1232641881 + 18118775236 = 35109^2 + 134606^2 .

It is a cyclic number.

It is not a de Polignac number, because 19351417117 - 2³ = 19351417109 is a prime.

It is a super-2 number, since 2×19351417117² (a number of 21 digits) contains 22 as substring.

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 19351417117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19351417147) 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, 108715738 + ... + 108715915.

It is an arithmetic number, because the mean of its divisors is an integer number (4892212215).

Almost surely, 2^19351417117 is an apocalyptic number.

It is an amenable number.

19351417117 is a deficient number, since it is larger than the sum of its proper divisors (217431743).

19351417117 is an equidigital number, since it uses as much as digits as its factorization.

19351417117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217431742.

The product of its digits is 26460, while the sum is 40.

The spelling of 19351417117 in words is "nineteen billion, three hundred fifty-one million, four hundred seventeen thousand, one hundred seventeen".