12661489 has 4 divisors (see below), whose sum is σ = 12668656. Its totient is φ = 12654324.

The previous prime is 12661483. The next prime is 12661499. The reversal of 12661489 is 98416621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12661489 - 2²³ = 4272881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12661483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1162 + ... + 5164.

It is an arithmetic number, because the mean of its divisors is an integer number (3167164).

Almost surely, 2^12661489 is an apocalyptic number.

It is an amenable number.

12661489 is a deficient number, since it is larger than the sum of its proper divisors (7167).

12661489 is an equidigital number, since it uses as much as digits as its factorization.

12661489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7166.

The product of its digits is 20736, while the sum is 37.

The square root of 12661489 is about 3558.2986102912. The cubic root of 12661489 is about 233.0745891474.

The spelling of 12661489 in words is "twelve million, six hundred sixty-one thousand, four hundred eighty-nine".