12781601 has 6 divisors (see below), whose sum is σ = 14868450. Its totient is φ = 10955616.

The previous prime is 12781589. The next prime is 12781607. The reversal of 12781601 is 10618721.

It can be written as a sum of positive squares in only one way, i.e., 10144225 + 2637376 = 3185^2 + 1624^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12781601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12781607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 130376 + ... + 130473.

It is an arithmetic number, because the mean of its divisors is an integer number (2478075).

Almost surely, 2^12781601 is an apocalyptic number.

It is an amenable number.

12781601 is a deficient number, since it is larger than the sum of its proper divisors (2086849).

12781601 is an equidigital number, since it uses as much as digits as its factorization.

12781601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260863 (or 260856 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 12781601 is about 3575.1365008906. The cubic root of 12781601 is about 233.8092840565.

The spelling of 12781601 in words is "twelve million, seven hundred eighty-one thousand, six hundred one".