1020113503 has 4 divisors (see below), whose sum is σ = 1064466288. Its totient is φ = 975760720.

The previous prime is 1020113453. The next prime is 1020113513. The reversal of 1020113503 is 3053110201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3053110201 = 89 ⋅34304609.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020113503 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 (1020113513) 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 3 ways as a sum of consecutive naturals, for example, 22176358 + ... + 22176403.

It is an arithmetic number, because the mean of its divisors is an integer number (266116572).

Almost surely, 2^1020113503 is an apocalyptic number.

1020113503 is a deficient number, since it is larger than the sum of its proper divisors (44352785).

1020113503 is an equidigital number, since it uses as much as digits as its factorization.

1020113503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44352784.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 1020113503 is about 31939.2157543043. The cubic root of 1020113503 is about 1006.6600463116.

Adding to 1020113503 its reverse (3053110201), we get a palindrome (4073223704).

The spelling of 1020113503 in words is "one billion, twenty million, one hundred thirteen thousand, five hundred three".