8219681 has 4 divisors (see below), whose sum is σ = 8484864. Its totient is φ = 7954500.

The previous prime is 8219657. The next prime is 8219711. The reversal of 8219681 is 1869128.

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 8219681 - 2¹⁴ = 8203297 is a prime.

It is a super-2 number, since 2×8219681² = 135126311483522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8219641) 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, 132545 + ... + 132606.

It is an arithmetic number, because the mean of its divisors is an integer number (2121216).

Almost surely, 2^8219681 is an apocalyptic number.

It is an amenable number.

8219681 is a deficient number, since it is larger than the sum of its proper divisors (265183).

8219681 is a wasteful number, since it uses less digits than its factorization.

8219681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265182.

The product of its digits is 6912, while the sum is 35.

The square root of 8219681 is about 2866.9986048131. The cubic root of 8219681 is about 201.8141691939.

The spelling of 8219681 in words is "eight million, two hundred nineteen thousand, six hundred eighty-one".