19028927917 has 4 divisors (see below), whose sum is σ = 20148276636. Its totient is φ = 17909579200.

The previous prime is 19028927903. The next prime is 19028927933. The reversal of 19028927917 is 71972982091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71972982091 = 19 ⋅3788051689.

It can be written as a sum of positive squares in 2 ways, for example, as 7982707716 + 11046220201 = 89346^2 + 105101^2 .

It is a cyclic number.

It is not a de Polignac number, because 19028927917 - 2⁷ = 19028927789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19028927947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559674334 + ... + 559674367.

It is an arithmetic number, because the mean of its divisors is an integer number (5037069159).

Almost surely, 2^19028927917 is an apocalyptic number.

19028927917 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19028927917 is a deficient number, since it is larger than the sum of its proper divisors (1119348719).

19028927917 is a wasteful number, since it uses less digits than its factorization.

19028927917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119348718.

The product of its (nonzero) digits is 1143072, while the sum is 55.

The spelling of 19028927917 in words is "nineteen billion, twenty-eight million, nine hundred twenty-seven thousand, nine hundred seventeen".