12135571 has 4 divisors (see below), whose sum is σ = 13869232. Its totient is φ = 10401912.

The previous prime is 12135551. The next prime is 12135577. The reversal of 12135571 is 17553121.

12135571 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 12135571 - 2⁷ = 12135443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12135577) 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, 866820 + ... + 866833.

It is an arithmetic number, because the mean of its divisors is an integer number (3467308).

Almost surely, 2^12135571 is an apocalyptic number.

12135571 is a deficient number, since it is larger than the sum of its proper divisors (1733661).

12135571 is an equidigital number, since it uses as much as digits as its factorization.

12135571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733660.

The product of its digits is 1050, while the sum is 25.

The square root of 12135571 is about 3483.6146457380. The cubic root of 12135571 is about 229.8017889056.

Adding to 12135571 its reverse (17553121), we get a palindrome (29688692).

The spelling of 12135571 in words is "twelve million, one hundred thirty-five thousand, five hundred seventy-one".