12281681 has 8 divisors (see below), whose sum is σ = 12446784. Its totient is φ = 12118000.

The previous prime is 12281671. The next prime is 12281693. The reversal of 12281681 is 18618221.

12281681 = 84² + 85² + ... + 334².

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-12281681 is a prime.

It is a super-2 number, since 2×12281681² = 301679376371522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12281641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41771 + ... + 42063.

It is an arithmetic number, because the mean of its divisors is an integer number (1555848).

Almost surely, 2^12281681 is an apocalyptic number.

It is an amenable number.

12281681 is a deficient number, since it is larger than the sum of its proper divisors (165103).

12281681 is a wasteful number, since it uses less digits than its factorization.

12281681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711.

The product of its digits is 1536, while the sum is 29.

The square root of 12281681 is about 3504.5229347231. The cubic root of 12281681 is about 230.7203690197.

The spelling of 12281681 in words is "twelve million, two hundred eighty-one thousand, six hundred eighty-one".