8415681 has 4 divisors (see below), whose sum is σ = 11220912. Its totient is φ = 5610452.

The previous prime is 8415661. The next prime is 8415691. The reversal of 8415681 is 1865148.

8415681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8415681 - 2⁷ = 8415553 is a prime.

It is a super-2 number, since 2×8415681² = 141647373387522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8415611) 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, 1402611 + ... + 1402616.

It is an arithmetic number, because the mean of its divisors is an integer number (2805228).

Almost surely, 2^8415681 is an apocalyptic number.

It is an amenable number.

8415681 is a deficient number, since it is larger than the sum of its proper divisors (2805231).

8415681 is a wasteful number, since it uses less digits than its factorization.

8415681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805230.

The product of its digits is 7680, while the sum is 33.

The square root of 8415681 is about 2900.9793174030. The cubic root of 8415681 is about 203.4056856794.

The spelling of 8415681 in words is "eight million, four hundred fifteen thousand, six hundred eighty-one".