19887486529 has 3 divisors (see below), whose sum is σ = 19887627553. Its totient is φ = 19887345506.

The previous prime is 19887486497. The next prime is 19887486581. The reversal of 19887486529 is 92568478891.

The square root of 19887486529 is 141023.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 19887486529 - 2⁵ = 19887486497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19887486929) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 70512 + ... + 211534.

Almost surely, 2^19887486529 is an apocalyptic number.

19887486529 is the 141023-rd square number.

19887486529 is the 70512-nd centered octagonal number.

It is an amenable number.

19887486529 is a deficient number, since it is larger than the sum of its proper divisors (141024).

19887486529 is an frugal number, since it uses more digits than its factorization.

19887486529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282046 (or 141023 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 67.

The spelling of 19887486529 in words is "nineteen billion, eight hundred eighty-seven million, four hundred eighty-six thousand, five hundred twenty-nine".