13031903 has 4 divisors (see below), whose sum is σ = 13039128. Its totient is φ = 13024680.

The previous prime is 13031899. The next prime is 13031981. The reversal of 13031903 is 30913031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13031903 - 2² = 13031899 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 (13031983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1625 + ... + 5357.

It is an arithmetic number, because the mean of its divisors is an integer number (3259782).

Almost surely, 2^13031903 is an apocalyptic number.

13031903 is a deficient number, since it is larger than the sum of its proper divisors (7225).

13031903 is an equidigital number, since it uses as much as digits as its factorization.

13031903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7224.

The product of its (nonzero) digits is 243, while the sum is 20.

The square root of 13031903 is about 3609.9727145783. The cubic root of 13031903 is about 235.3256568495.

Adding to 13031903 its reverse (30913031), we get a palindrome (43944934).

The spelling of 13031903 in words is "thirteen million, thirty-one thousand, nine hundred three".