113203123 has 24 divisors (see below), whose sum is σ = 128605680. Its totient is φ = 99528000.

The previous prime is 113203109. The next prime is 113203157. The reversal of 113203123 is 321302311.

It is not a de Polignac number, because 113203123 - 2¹⁷ = 113072051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113203097 and 113203106.

It is not an unprimeable number, because it can be changed into a prime (113203163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 720961 + ... + 721117.

It is an arithmetic number, because the mean of its divisors is an integer number (5358570).

Almost surely, 2^113203123 is an apocalyptic number.

113203123 is a deficient number, since it is larger than the sum of its proper divisors (15402557).

113203123 is a wasteful number, since it uses less digits than its factorization.

113203123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 113203123 is about 10639.6956253457. The cubic root of 113203123 is about 483.7483195619.

Adding to 113203123 its reverse (321302311), we get a palindrome (434505434).

The spelling of 113203123 in words is "one hundred thirteen million, two hundred three thousand, one hundred twenty-three".