868631 has 4 divisors (see below), whose sum is σ = 876432. Its totient is φ = 860832.

The previous prime is 868613. The next prime is 868639. The reversal of 868631 is 136868.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868631 is a prime.

It is a super-2 number, since 2×868631² = 1509039628322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868639) 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, 3731 + ... + 3956.

It is an arithmetic number, because the mean of its divisors is an integer number (219108).

2⁸⁶⁸⁶³¹ is an apocalyptic number.

868631 is a deficient number, since it is larger than the sum of its proper divisors (7801).

868631 is a wasteful number, since it uses less digits than its factorization.

868631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7800.

The product of its digits is 6912, while the sum is 32.

The square root of 868631 is about 932.0037553572. The cubic root of 868631 is about 95.4139279124.

The spelling of 868631 in words is "eight hundred sixty-eight thousand, six hundred thirty-one".