13131533 has 4 divisors (see below), whose sum is σ = 13147680. Its totient is φ = 13115388.

The previous prime is 13131529. The next prime is 13131541. The reversal of 13131533 is 33513131.

13131533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33513131 = 19 ⋅1763849.

It is a cyclic number.

It is not a de Polignac number, because 13131533 - 2² = 13131529 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 (13131523) 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, 6785 + ... + 8502.

It is an arithmetic number, because the mean of its divisors is an integer number (3286920).

Almost surely, 2^13131533 is an apocalyptic number.

It is an amenable number.

13131533 is a deficient number, since it is larger than the sum of its proper divisors (16147).

13131533 is an equidigital number, since it uses as much as digits as its factorization.

13131533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16146.

The product of its digits is 405, while the sum is 20.

The square root of 13131533 is about 3623.7457140368. The cubic root of 13131533 is about 235.9238299142.

Adding to 13131533 its reverse (33513131), we get a palindrome (46644664).

The spelling of 13131533 in words is "thirteen million, one hundred thirty-one thousand, five hundred thirty-three".