12721567 has 8 divisors (see below), whose sum is σ = 12972960. Its totient is φ = 12472320.

The previous prime is 12721549. The next prime is 12721601. The reversal of 12721567 is 76512721.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12721567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12724567) 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, 16159 + ... + 16927.

It is an arithmetic number, because the mean of its divisors is an integer number (1621620).

Almost surely, 2^12721567 is an apocalyptic number.

12721567 is a deficient number, since it is larger than the sum of its proper divisors (251393).

12721567 is an equidigital number, since it uses as much as digits as its factorization.

12721567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073.

The product of its digits is 5880, while the sum is 31.

The square root of 12721567 is about 3566.7305757514. The cubic root of 12721567 is about 233.4426492314.

The spelling of 12721567 in words is "twelve million, seven hundred twenty-one thousand, five hundred sixty-seven".