12601681 has 4 divisors (see below), whose sum is σ = 12611392. Its totient is φ = 12591972.

The previous prime is 12601663. The next prime is 12601691. The reversal of 12601681 is 18610621.

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 12601681 - 2¹¹ = 12599633 is a prime.

It is a super-2 number, since 2×12601681² = 317604728051522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12601621) 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, 2541 + ... + 5626.

It is an arithmetic number, because the mean of its divisors is an integer number (3152848).

Almost surely, 2^12601681 is an apocalyptic number.

It is an amenable number.

12601681 is a deficient number, since it is larger than the sum of its proper divisors (9711).

12601681 is an equidigital number, since it uses as much as digits as its factorization.

12601681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9710.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12601681 is about 3549.8846460132. The cubic root of 12601681 is about 232.7070249154.

The spelling of 12601681 in words is "twelve million, six hundred one thousand, six hundred eighty-one".