123513503 has 4 divisors (see below), whose sum is σ = 123771840. Its totient is φ = 123255168.

The previous prime is 123513499. The next prime is 123513521. The reversal of 123513503 is 305315321.

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

It is a cyclic number.

It is not a de Polignac number, because 123513503 - 2² = 123513499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123513553) 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 3 ways as a sum of consecutive naturals, for example, 128450 + ... + 129407.

It is an arithmetic number, because the mean of its divisors is an integer number (30942960).

Almost surely, 2^123513503 is an apocalyptic number.

123513503 is a deficient number, since it is larger than the sum of its proper divisors (258337).

123513503 is an equidigital number, since it uses as much as digits as its factorization.

123513503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258336.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 123513503 is about 11113.6628975329. The cubic root of 123513503 is about 498.0100950626.

Adding to 123513503 its reverse (305315321), we get a palindrome (428828824).

The spelling of 123513503 in words is "one hundred twenty-three million, five hundred thirteen thousand, five hundred three".