12187619489 has 4 divisors (see below), whose sum is σ = 12607882260. Its totient is φ = 11767356720.

The previous prime is 12187619471. The next prime is 12187619513. The reversal of 12187619489 is 98491678121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4406968225 + 7780651264 = 66385^2 + 88208^2 .

It is a cyclic number.

It is not a de Polignac number, because 12187619489 - 2¹² = 12187615393 is a prime.

It is a super-2 number, since 2×12187619489² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12187619429) 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, 210131342 + ... + 210131399.

It is an arithmetic number, because the mean of its divisors is an integer number (3151970565).

Almost surely, 2^12187619489 is an apocalyptic number.

It is an amenable number.

12187619489 is a deficient number, since it is larger than the sum of its proper divisors (420262771).

12187619489 is an equidigital number, since it uses as much as digits as its factorization.

12187619489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420262770.

The product of its digits is 1741824, while the sum is 56.

The spelling of 12187619489 in words is "twelve billion, one hundred eighty-seven million, six hundred nineteen thousand, four hundred eighty-nine".