8001681 has 4 divisors (see below), whose sum is σ = 10668912. Its totient is φ = 5334452.

The previous prime is 8001667. The next prime is 8001727. The reversal of 8001681 is 1861008.

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.

It is a cyclic number.

It is not a de Polignac number, because 8001681 - 2¹⁴ = 7985297 is a prime.

It is a super-2 number, since 2×8001681² = 128053797651522, which contains 22 as substring.

It is an Ulam number.

8001681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8001661) 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, 1333611 + ... + 1333616.

It is an arithmetic number, because the mean of its divisors is an integer number (2667228).

Almost surely, 2^8001681 is an apocalyptic number.

It is an amenable number.

8001681 is a deficient number, since it is larger than the sum of its proper divisors (2667231).

8001681 is a wasteful number, since it uses less digits than its factorization.

8001681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2667230.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 8001681 is about 2828.7242707624. The cubic root of 8001681 is about 200.0140073523.

Adding to 8001681 its reverse (1861008), we get a palindrome (9862689).

The spelling of 8001681 in words is "eight million, one thousand, six hundred eighty-one".