868551 has 8 divisors (see below), whose sum is σ = 1171440. Its totient is φ = 572352.

The previous prime is 868537. The next prime is 868559. The reversal of 868551 is 155868.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 868551 - 2⁶ = 868487 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1360 + ... + 1893.

It is an arithmetic number, because the mean of its divisors is an integer number (146430).

2⁸⁶⁸⁵⁵¹ is an apocalyptic number.

868551 is a deficient number, since it is larger than the sum of its proper divisors (302889).

868551 is a wasteful number, since it uses less digits than its factorization.

868551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3345.

The product of its digits is 9600, while the sum is 33.

The square root of 868551 is about 931.9608360870. The cubic root of 868551 is about 95.4109986484.

The spelling of 868551 in words is "eight hundred sixty-eight thousand, five hundred fifty-one".