12135553 has 4 divisors (see below), whose sum is σ = 12160960. Its totient is φ = 12110148.

The previous prime is 12135551. The next prime is 12135577. The reversal of 12135553 is 35553121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 35553121 = 157 ⋅226453.

It is a cyclic number.

It is not a de Polignac number, because 12135553 - 2¹ = 12135551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12135551) 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, 11973 + ... + 12946.

It is an arithmetic number, because the mean of its divisors is an integer number (3040240).

Almost surely, 2^12135553 is an apocalyptic number.

It is an amenable number.

12135553 is a deficient number, since it is larger than the sum of its proper divisors (25407).

12135553 is an equidigital number, since it uses as much as digits as its factorization.

12135553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25406.

The product of its digits is 2250, while the sum is 25.

The square root of 12135553 is about 3483.6120622136. The cubic root of 12135553 is about 229.8016752882.

Adding to 12135553 its reverse (35553121), we get a palindrome (47688674).

The spelling of 12135553 in words is "twelve million, one hundred thirty-five thousand, five hundred fifty-three".