12745561 has 8 divisors (see below), whose sum is σ = 13456800. Its totient is φ = 12038400.

The previous prime is 12745549. The next prime is 12745567. The reversal of 12745561 is 16554721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12745561 - 2¹¹ = 12743513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12745567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7161 + ... + 8761.

It is an arithmetic number, because the mean of its divisors is an integer number (1682100).

Almost surely, 2^12745561 is an apocalyptic number.

It is an amenable number.

12745561 is a deficient number, since it is larger than the sum of its proper divisors (711239).

12745561 is a wasteful number, since it uses less digits than its factorization.

12745561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039.

The product of its digits is 8400, while the sum is 31.

The square root of 12745561 is about 3570.0925758305. The cubic root of 12745561 is about 233.5893215489.

The spelling of 12745561 in words is "twelve million, seven hundred forty-five thousand, five hundred sixty-one".