113123781 has 6 divisors (see below), whose sum is σ = 163401030. Its totient is φ = 75415848.

The previous prime is 113123711. The next prime is 113123833. The reversal of 113123781 is 187321311.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 91584900 + 21538881 = 9570^2 + 4641^2 .

It is not a de Polignac number, because 113123781 - 2⁷ = 113123653 is a prime.

It is a super-2 number, since 2×113123781² = 25593979655471922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113123711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6284646 + ... + 6284663.

It is an arithmetic number, because the mean of its divisors is an integer number (27233505).

Almost surely, 2^113123781 is an apocalyptic number.

It is an amenable number.

113123781 is a deficient number, since it is larger than the sum of its proper divisors (50277249).

113123781 is a wasteful number, since it uses less digits than its factorization.

113123781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12569315 (or 12569312 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 113123781 is about 10635.9663876866. The cubic root of 113123781 is about 483.6352763624.

The spelling of 113123781 in words is "one hundred thirteen million, one hundred twenty-three thousand, seven hundred eighty-one".