123116861 has 24 divisors (see below), whose sum is σ = 154638720. Its totient is φ = 97433952.

The previous prime is 123116843. The next prime is 123116867. The reversal of 123116861 is 168611321.

It is a de Polignac number, because none of the positive numbers 2^k-123116861 is a prime.

It is a super-2 number, since 2×123116861² = 30315522924986642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123116867) 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 23 ways as a sum of consecutive naturals, for example, 30800 + ... + 34566.

It is an arithmetic number, because the mean of its divisors is an integer number (6443280).

Almost surely, 2^123116861 is an apocalyptic number.

It is an amenable number.

123116861 is a deficient number, since it is larger than the sum of its proper divisors (31521859).

123116861 is a wasteful number, since it uses less digits than its factorization.

123116861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3833 (or 3826 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 123116861 is about 11095.8037563757. The cubic root of 123116861 is about 497.4764326437.

The spelling of 123116861 in words is "one hundred twenty-three million, one hundred sixteen thousand, eight hundred sixty-one".