8144681 has 4 divisors (see below), whose sum is σ = 8170692. Its totient is φ = 8118672.

The previous prime is 8144671. The next prime is 8144687. The reversal of 8144681 is 1864418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1864418 = 2 ⋅932209.

It can be written as a sum of positive squares in 2 ways, for example, as 3667225 + 4477456 = 1915^2 + 2116^2 .

It is a cyclic number.

It is not a de Polignac number, because 8144681 - 2¹⁰ = 8143657 is a prime.

It is a super-2 number, since 2×8144681² = 132671657183522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8144687) 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, 12530 + ... + 13163.

It is an arithmetic number, because the mean of its divisors is an integer number (2042673).

Almost surely, 2^8144681 is an apocalyptic number.

It is an amenable number.

8144681 is a deficient number, since it is larger than the sum of its proper divisors (26011).

8144681 is a wasteful number, since it uses less digits than its factorization.

8144681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26010.

The product of its digits is 6144, while the sum is 32.

The square root of 8144681 is about 2853.8887504596. Note that the first 3 decimals coincide. The cubic root of 8144681 is about 201.1984788964.

The spelling of 8144681 in words is "eight million, one hundred forty-four thousand, six hundred eighty-one".