131533 has 4 divisors (see below), whose sum is σ = 135808. Its totient is φ = 127260.

The previous prime is 131519. The next prime is 131543. The reversal of 131533 is 335131.

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.

It is a cyclic number.

It is not a de Polignac number, because 131533 - 2⁵ = 131501 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 (131543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2091 + ... + 2152.

It is an arithmetic number, because the mean of its divisors is an integer number (33952).

2¹³¹⁵³³ is an apocalyptic number.

It is an amenable number.

131533 is a deficient number, since it is larger than the sum of its proper divisors (4275).

131533 is an equidigital number, since it uses as much as digits as its factorization.

131533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4274.

The product of its digits is 135, while the sum is 16.

The square root of 131533 is about 362.6747854483. The cubic root of 131533 is about 50.8563173557.

Adding to 131533 its reverse (335131), we get a palindrome (466664).

The spelling of 131533 in words is "one hundred thirty-one thousand, five hundred thirty-three".