12528996489 has 15 divisors (see below), whose sum is σ = 18717660247. Its totient is φ = 8351992728.

The previous prime is 12528996457. The next prime is 12528996539. The reversal of 12528996489 is 98469982521.

The square root of 12528996489 is 111933.

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

12528996489 is a `hidden beast` number, since 12 + 52 + 8 + 9 + 96 + 489 = 666.

It can be written as a sum of positive squares in only one way, i.e., 449228025 + 12079768464 = 21195^2 + 109908^2 .

It is not a de Polignac number, because 12528996489 - 2⁵ = 12528996457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12528996409) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1001179 + ... + 1013615.

Almost surely, 2^12528996489 is an apocalyptic number.

12528996489 is the 111933-rd square number.

12528996489 is the 55967-th centered octagonal number.

It is an amenable number.

12528996489 is a deficient number, since it is larger than the sum of its proper divisors (6188663758).

12528996489 is an frugal number, since it uses more digits than its factorization.

12528996489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24886 (or 12440 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 63.

The spelling of 12528996489 in words is "twelve billion, five hundred twenty-eight million, nine hundred ninety-six thousand, four hundred eighty-nine".