12531799887 has 4 divisors (see below), whose sum is σ = 16709066520. Its totient is φ = 8354533256.

The previous prime is 12531799873. The next prime is 12531799897. The reversal of 12531799887 is 78899713521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12531799887 - 2⁴ = 12531799871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12531799887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531799807) 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, 2088633312 + ... + 2088633317.

It is an arithmetic number, because the mean of its divisors is an integer number (4177266630).

Almost surely, 2^12531799887 is an apocalyptic number.

12531799887 is a deficient number, since it is larger than the sum of its proper divisors (4177266633).

12531799887 is an equidigital number, since it uses as much as digits as its factorization.

12531799887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4177266632.

The product of its digits is 7620480, while the sum is 60.

The spelling of 12531799887 in words is "twelve billion, five hundred thirty-one million, seven hundred ninety-nine thousand, eight hundred eighty-seven".