868831621 has 4 divisors (see below), whose sum is σ = 992950432. Its totient is φ = 744712812.

The previous prime is 868831591. The next prime is 868831627. The reversal of 868831621 is 126138868.

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 868831621 - 2⁵ = 868831589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868831627) 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, 62059395 + ... + 62059408.

It is an arithmetic number, because the mean of its divisors is an integer number (248237608).

Almost surely, 2^868831621 is an apocalyptic number.

It is an amenable number.

868831621 is a deficient number, since it is larger than the sum of its proper divisors (124118811).

868831621 is a wasteful number, since it uses less digits than its factorization.

868831621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124118810.

The product of its digits is 110592, while the sum is 43.

The square root of 868831621 is about 29475.9498744315. The cubic root of 868831621 is about 954.2127301989.

The spelling of 868831621 in words is "eight hundred sixty-eight million, eight hundred thirty-one thousand, six hundred twenty-one".