120812861 has 6 divisors (see below), whose sum is σ = 130821210. Its totient is φ = 111519408.

The previous prime is 120812831. The next prime is 120812893. The reversal of 120812861 is 168218021.

It can be written as a sum of positive squares in 3 ways, for example, as 32761 + 120780100 = 181^2 + 10990^2 .

It is not a de Polignac number, because 120812861 - 2¹⁰ = 120811837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120812801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 357266 + ... + 357603.

It is an arithmetic number, because the mean of its divisors is an integer number (21803535).

Almost surely, 2^120812861 is an apocalyptic number.

It is an amenable number.

120812861 is a deficient number, since it is larger than the sum of its proper divisors (10008349).

120812861 is an equidigital number, since it uses as much as digits as its factorization.

120812861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714895 (or 714882 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 120812861 is about 10991.4903902974. The cubic root of 120812861 is about 494.3536249171.

The spelling of 120812861 in words is "one hundred twenty million, eight hundred twelve thousand, eight hundred sixty-one".