861800621 has 8 divisors (see below), whose sum is σ = 940843488. Its totient is φ = 782874000.

The previous prime is 861800581. The next prime is 861800623. The reversal of 861800621 is 126008168.

861800621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 861800621 - 2¹⁸ = 861538477 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 (861800623) 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, 13175 + ... + 43556.

It is an arithmetic number, because the mean of its divisors is an integer number (117605436).

Almost surely, 2^861800621 is an apocalyptic number.

It is an amenable number.

861800621 is a deficient number, since it is larger than the sum of its proper divisors (79042867).

861800621 is a wasteful number, since it uses less digits than its factorization.

861800621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58123.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 861800621 is about 29356.4408775996. The cubic root of 861800621 is about 951.6317739609.

Adding to 861800621 its reverse (126008168), we get a palindrome (987808789).

The spelling of 861800621 in words is "eight hundred sixty-one million, eight hundred thousand, six hundred twenty-one".