861922855 has 4 divisors (see below), whose sum is σ = 1034307432. Its totient is φ = 689538280.

The previous prime is 861922843. The next prime is 861922883. The reversal of 861922855 is 558229168.

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

It is not a de Polignac number, because 861922855 - 2⁷ = 861922727 is a prime.

It is a super-2 number, since 2×861922855² = 1485822015942702050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86192281 + ... + 86192290.

It is an arithmetic number, because the mean of its divisors is an integer number (258576858).

Almost surely, 2^861922855 is an apocalyptic number.

861922855 is a deficient number, since it is larger than the sum of its proper divisors (172384577).

861922855 is a wasteful number, since it uses less digits than its factorization.

861922855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172384576.

The product of its digits is 345600, while the sum is 46.

The square root of 861922855 is about 29358.5226978470. The cubic root of 861922855 is about 951.6767635855.

The spelling of 861922855 in words is "eight hundred sixty-one million, nine hundred twenty-two thousand, eight hundred fifty-five".