863211973 has 8 divisors (see below), whose sum is σ = 930281688. Its totient is φ = 796237824.

The previous prime is 863211931. The next prime is 863211983. The reversal of 863211973 is 379112368.

It can be written as a sum of positive squares in 4 ways, for example, as 97970404 + 765241569 = 9898^2 + 27663^2 .

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 863211973 - 2¹⁷ = 863080901 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 (863211983) 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, 4540 + ... + 41797.

It is an arithmetic number, because the mean of its divisors is an integer number (116285211).

Almost surely, 2^863211973 is an apocalyptic number.

It is an amenable number.

863211973 is a deficient number, since it is larger than the sum of its proper divisors (67069715).

863211973 is a wasteful number, since it uses less digits than its factorization.

863211973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47783.

The product of its digits is 54432, while the sum is 40.

The square root of 863211973 is about 29380.4692440403. The cubic root of 863211973 is about 952.1509794707.

The spelling of 863211973 in words is "eight hundred sixty-three million, two hundred eleven thousand, nine hundred seventy-three".