12031523 has 4 divisors (see below), whose sum is σ = 13750320. Its totient is φ = 10312728.

The previous prime is 12031517. The next prime is 12031543. The reversal of 12031523 is 32513021.

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 12031523 - 2⁸ = 12031267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12031543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 859388 + ... + 859401.

It is an arithmetic number, because the mean of its divisors is an integer number (3437580).

Almost surely, 2^12031523 is an apocalyptic number.

12031523 is a deficient number, since it is larger than the sum of its proper divisors (1718797).

12031523 is an equidigital number, since it uses as much as digits as its factorization.

12031523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718796.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 12031523 is about 3468.6485841030. The cubic root of 12031523 is about 229.1431444875.

Adding to 12031523 its reverse (32513021), we get a palindrome (44544544).

The spelling of 12031523 in words is "twelve million, thirty-one thousand, five hundred twenty-three".