13203131 has 4 divisors (see below), whose sum is σ = 13212264. Its totient is φ = 13194000.

The previous prime is 13203103. The next prime is 13203139. The reversal of 13203131 is 13130231.

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 13203131 - 2¹⁰ = 13202107 is a prime.

It is a super-2 number, since 2×13203131² = 348645336406322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13203139) 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, 1865 + ... + 5466.

It is an arithmetic number, because the mean of its divisors is an integer number (3303066).

Almost surely, 2^13203131 is an apocalyptic number.

13203131 is a deficient number, since it is larger than the sum of its proper divisors (9133).

13203131 is an equidigital number, since it uses as much as digits as its factorization.

13203131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9132.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 13203131 is about 3633.6112890622. The cubic root of 13203131 is about 236.3518344520.

Adding to 13203131 its reverse (13130231), we get a palindrome (26333362).

Subtracting from 13203131 its reverse (13130231), we obtain a square (72900 = 270²).

The spelling of 13203131 in words is "thirteen million, two hundred three thousand, one hundred thirty-one".