122855781 has 8 divisors (see below), whose sum is σ = 163879200. Its totient is φ = 81868112.

The previous prime is 122855771. The next prime is 122855783. The reversal of 122855781 is 187558221.

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 122855781 - 2⁶ = 122855717 is a prime.

It is a super-2 number, since 2×122855781² = 30187085850239922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122855783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511 + ... + 15683.

It is an arithmetic number, because the mean of its divisors is an integer number (20484900).

Almost surely, 2^122855781 is an apocalyptic number.

It is an amenable number.

122855781 is a deficient number, since it is larger than the sum of its proper divisors (41023419).

122855781 is a wasteful number, since it uses less digits than its factorization.

122855781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17875.

The product of its digits is 44800, while the sum is 39.

The square root of 122855781 is about 11084.0327047515. The cubic root of 122855781 is about 497.1245364523.

The spelling of 122855781 in words is "one hundred twenty-two million, eight hundred fifty-five thousand, seven hundred eighty-one".