12673561 has 4 divisors (see below), whose sum is σ = 12714624. Its totient is φ = 12632500.

The previous prime is 12673537. The next prime is 12673567. The reversal of 12673561 is 16537621.

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 an emirpimes, since its reverse is a distinct semiprime: 16537621 = 23 ⋅719027.

It is a cyclic number.

It is not a de Polignac number, because 12673561 - 2⁹ = 12673049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12673567) 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, 20065 + ... + 20686.

It is an arithmetic number, because the mean of its divisors is an integer number (3178656).

Almost surely, 2^12673561 is an apocalyptic number.

It is an amenable number.

12673561 is a deficient number, since it is larger than the sum of its proper divisors (41063).

12673561 is an equidigital number, since it uses as much as digits as its factorization.

12673561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41062.

The product of its digits is 7560, while the sum is 31.

The square root of 12673561 is about 3559.9945224677. The cubic root of 12673561 is about 233.1486400137.

The spelling of 12673561 in words is "twelve million, six hundred seventy-three thousand, five hundred sixty-one".