868551681 has 16 divisors (see below), whose sum is σ = 1188937728. Its totient is φ = 563730000.

The previous prime is 868551661. The next prime is 868551683. The reversal of 868551681 is 186155868.

It is not a de Polignac number, because 868551681 - 2⁹ = 868551169 is a prime.

It is a super-2 number, since 2×868551681² = 1508764045135851522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 868551681.

It is not an unprimeable number, because it can be changed into a prime (868551683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10806 + ... + 43056.

It is an arithmetic number, because the mean of its divisors is an integer number (74308608).

Almost surely, 2^868551681 is an apocalyptic number.

It is an amenable number.

868551681 is a deficient number, since it is larger than the sum of its proper divisors (320386047).

868551681 is a wasteful number, since it uses less digits than its factorization.

868551681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32492.

The product of its digits is 460800, while the sum is 48.

The square root of 868551681 is about 29471.2008747523. The cubic root of 868551681 is about 954.1102358453.

The spelling of 868551681 in words is "eight hundred sixty-eight million, five hundred fifty-one thousand, six hundred eighty-one".