12319561 has 4 divisors (see below), whose sum is σ = 12327552. Its totient is φ = 12311572.

The previous prime is 12319537. The next prime is 12319579. The reversal of 12319561 is 16591321.

12319561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 12319561 - 2⁵ = 12319529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12319511) 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, 865 + ... + 5038.

It is an arithmetic number, because the mean of its divisors is an integer number (3081888).

Almost surely, 2^12319561 is an apocalyptic number.

It is an amenable number.

12319561 is a deficient number, since it is larger than the sum of its proper divisors (7991).

12319561 is an equidigital number, since it uses as much as digits as its factorization.

12319561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7990.

The product of its digits is 1620, while the sum is 28.

The square root of 12319561 is about 3509.9232185334. The cubic root of 12319561 is about 230.9573267500.

It can be divided in two parts, 123195 and 61, that added together give a triangular number (123256 = T₄₉₆).

The spelling of 12319561 in words is "twelve million, three hundred nineteen thousand, five hundred sixty-one".