19128589129 has 4 divisors (see below), whose sum is σ = 20600019076. Its totient is φ = 17657159184.

The previous prime is 19128589097. The next prime is 19128589187. The reversal of 19128589129 is 92198582191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92198582191 = 1303 ⋅70758697.

It can be written as a sum of positive squares in 2 ways, for example, as 7351347600 + 11777241529 = 85740^2 + 108523^2 .

It is a cyclic number.

It is not a de Polignac number, because 19128589129 - 2⁵ = 19128589097 is a prime.

It is a super-3 number, since 3×19128589129³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19128589129.

It is not an unprimeable number, because it can be changed into a prime (19128589199) 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, 735714954 + ... + 735714979.

It is an arithmetic number, because the mean of its divisors is an integer number (5150004769).

Almost surely, 2^19128589129 is an apocalyptic number.

It is an amenable number.

19128589129 is a deficient number, since it is larger than the sum of its proper divisors (1471429947).

19128589129 is a wasteful number, since it uses less digits than its factorization.

19128589129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471429946.

The product of its digits is 933120, while the sum is 55.

The spelling of 19128589129 in words is "nineteen billion, one hundred twenty-eight million, five hundred eighty-nine thousand, one hundred twenty-nine".