112123781 has 16 divisors (see below), whose sum is σ = 145870848. Its totient is φ = 83569200.

The previous prime is 112123771. The next prime is 112123793. The reversal of 112123781 is 187321211.

It is not a de Polignac number, because 112123781 - 2¹⁴ = 112107397 is a prime.

It is a super-2 number, since 2×112123781² = 25143484531471922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 112123781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112123741) 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 15 ways as a sum of consecutive naturals, for example, 29885 + ... + 33426.

It is an arithmetic number, because the mean of its divisors is an integer number (9116928).

Almost surely, 2^112123781 is an apocalyptic number.

112123781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

112123781 is a deficient number, since it is larger than the sum of its proper divisors (33747067).

112123781 is a wasteful number, since it uses less digits than its factorization.

112123781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63352.

The product of its digits is 672, while the sum is 26.

The square root of 112123781 is about 10588.8517318924. The cubic root of 112123781 is about 482.2059647300.

Adding to 112123781 its reverse (187321211), we get a palindrome (299444992).

The spelling of 112123781 in words is "one hundred twelve million, one hundred twenty-three thousand, seven hundred eighty-one".