113643121 has 4 divisors (see below), whose sum is σ = 114920100. Its totient is φ = 112366144.

The previous prime is 113643119. The next prime is 113643143. The reversal of 113643121 is 121346311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10336225 + 103306896 = 3215^2 + 10164^2 .

It is a cyclic number.

It is not a de Polignac number, because 113643121 - 2¹ = 113643119 is a prime.

It is a super-3 number, since 3×113643121³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113643092 and 113643101.

It is not an unprimeable number, because it can be changed into a prime (113643151) 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 3 ways as a sum of consecutive naturals, for example, 638356 + ... + 638533.

It is an arithmetic number, because the mean of its divisors is an integer number (28730025).

Almost surely, 2^113643121 is an apocalyptic number.

It is an amenable number.

113643121 is a deficient number, since it is larger than the sum of its proper divisors (1276979).

113643121 is an equidigital number, since it uses as much as digits as its factorization.

113643121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276978.

The product of its digits is 432, while the sum is 22.

The square root of 113643121 is about 10660.3527615178. The cubic root of 113643121 is about 484.3742537678.

Adding to 113643121 its reverse (121346311), we get a palindrome (234989432).

The spelling of 113643121 in words is "one hundred thirteen million, six hundred forty-three thousand, one hundred twenty-one".