12135511 has 4 divisors (see below), whose sum is σ = 12144024. Its totient is φ = 12127000.

The previous prime is 12135499. The next prime is 12135521. The reversal of 12135511 is 11553121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12135511 - 2⁵ = 12135479 is a prime.

It is a super-2 number, since 2×12135511² = 294541254462242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12135521) 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, 1540 + ... + 5161.

It is an arithmetic number, because the mean of its divisors is an integer number (3036006).

Almost surely, 2^12135511 is an apocalyptic number.

12135511 is a deficient number, since it is larger than the sum of its proper divisors (8513).

12135511 is an equidigital number, since it uses as much as digits as its factorization.

12135511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8512.

The product of its digits is 150, while the sum is 19.

The square root of 12135511 is about 3483.6060339826. The cubic root of 12135511 is about 229.8014101807.

Adding to 12135511 its reverse (11553121), we get a palindrome (23688632).

It can be divided in two parts, 1213 and 5511, that added together give a square (6724 = 82²).

The spelling of 12135511 in words is "twelve million, one hundred thirty-five thousand, five hundred eleven".