12133531 has 4 divisors (see below), whose sum is σ = 12287200. Its totient is φ = 11979864.

The previous prime is 12133523. The next prime is 12133543. The reversal of 12133531 is 13533121.

12133531 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.

It is a cyclic number.

It is not a de Polignac number, because 12133531 - 2³ = 12133523 is a prime.

It is a super-2 number, since 2×12133531² = 294445149055922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12133499 and 12133508.

It is not an unprimeable number, because it can be changed into a prime (12133031) 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, 76716 + ... + 76873.

It is an arithmetic number, because the mean of its divisors is an integer number (3071800).

Almost surely, 2^12133531 is an apocalyptic number.

12133531 is a deficient number, since it is larger than the sum of its proper divisors (153669).

12133531 is an equidigital number, since it uses as much as digits as its factorization.

12133531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153668.

The product of its digits is 270, while the sum is 19.

The square root of 12133531 is about 3483.3218341118. The cubic root of 12133531 is about 229.7889115574.

Adding to 12133531 its reverse (13533121), we get a palindrome (25666652).

The spelling of 12133531 in words is "twelve million, one hundred thirty-three thousand, five hundred thirty-one".