19115133987 has 6 divisors (see below), whose sum is σ = 25487164612. Its totient is φ = 12743263012.

The previous prime is 19115133937. The next prime is 19115134007. The reversal of 19115133987 is 78933151191.

It is not a de Polignac number, because 19115133987 - 2¹⁵ = 19115101219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19115133937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199558 + ... + 279380.

Almost surely, 2^19115133987 is an apocalyptic number.

19115133987 is a deficient number, since it is larger than the sum of its proper divisors (6372030625).

19115133987 is an frugal number, since it uses more digits than its factorization.

19115133987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159649 (or 79826 counting only the distinct ones).

The product of its digits is 204120, while the sum is 48.

Multiplying 19115133987 by its sum of digits (48), we get a square (917526431376 = 957876²).

The spelling of 19115133987 in words is "nineteen billion, one hundred fifteen million, one hundred thirty-three thousand, nine hundred eighty-seven".