861312267 has 24 divisors (see below), whose sum is σ = 1308855600. Its totient is φ = 545001408.

The previous prime is 861312251. The next prime is 861312299. The reversal of 861312267 is 762213168.

861312267 is a `hidden beast` number, since 8 + 613 + 12 + 26 + 7 = 666.

861312267 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 861312267 - 2⁴ = 861312251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861312247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12568 + ... + 43365.

It is an arithmetic number, because the mean of its divisors is an integer number (54535650).

Almost surely, 2^861312267 is an apocalyptic number.

861312267 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

861312267 is a deficient number, since it is larger than the sum of its proper divisors (447543333).

861312267 is a wasteful number, since it uses less digits than its factorization.

861312267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56027 (or 56024 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 861312267 is about 29348.1220353194. The cubic root of 861312267 is about 951.4519872127.

Subtracting from 861312267 its reverse (762213168), we obtain a palindrome (99099099).

The spelling of 861312267 in words is "eight hundred sixty-one million, three hundred twelve thousand, two hundred sixty-seven".