1013203123 has 4 divisors (see below), whose sum is σ = 1013560128. Its totient is φ = 1012846120.

The previous prime is 1013203099. The next prime is 1013203133. The reversal of 1013203123 is 3213023101.

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 1013203123 - 2²⁹ = 476332211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1013203097 and 1013203106.

It is not an unprimeable number, because it can be changed into a prime (1013203133) 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, 174211 + ... + 179932.

It is an arithmetic number, because the mean of its divisors is an integer number (253390032).

Almost surely, 2^1013203123 is an apocalyptic number.

1013203123 is a deficient number, since it is larger than the sum of its proper divisors (357005).

1013203123 is an equidigital number, since it uses as much as digits as its factorization.

1013203123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357004.

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

The square root of 1013203123 is about 31830.8517479504. The cubic root of 1013203123 is about 1004.3818126737.

Adding to 1013203123 its reverse (3213023101), we get a palindrome (4226226224).

The spelling of 1013203123 in words is "one billion, thirteen million, two hundred three thousand, one hundred twenty-three".