861872225293 has 4 divisors (see below), whose sum is σ = 861980877148. Its totient is φ = 861763573440.

The previous prime is 861872225239. The next prime is 861872225323. The reversal of 861872225293 is 392522278168.

861872225293 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 522074167209 + 339798058084 = 722547^2 + 582922^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861872225293 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 (861872225693) 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, 54314028 + ... + 54329893.

It is an arithmetic number, because the mean of its divisors is an integer number (215495219287).

Almost surely, 2^861872225293 is an apocalyptic number.

It is an amenable number.

861872225293 is a deficient number, since it is larger than the sum of its proper divisors (108651855).

861872225293 is a wasteful number, since it uses less digits than its factorization.

861872225293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108651854.

The product of its digits is 5806080, while the sum is 55.

The spelling of 861872225293 in words is "eight hundred sixty-one billion, eight hundred seventy-two million, two hundred twenty-five thousand, two hundred ninety-three".