12135555 has 32 divisors (see below), whose sum is σ = 21721920. Its totient is φ = 6428160.

The previous prime is 12135551. The next prime is 12135577. The reversal of 12135555 is 55553121.

It is not a de Polignac number, because 12135555 - 2² = 12135551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12135551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32349 + ... + 32721.

It is an arithmetic number, because the mean of its divisors is an integer number (678810).

Almost surely, 2^12135555 is an apocalyptic number.

12135555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12135555 is a deficient number, since it is larger than the sum of its proper divisors (9586365).

12135555 is a wasteful number, since it uses less digits than its factorization.

12135555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 622 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 12135555 is about 3483.6123492719. The cubic root of 12135555 is about 229.8016879124.

Adding to 12135555 its reverse (55553121), we get a palindrome (67688676).

The spelling of 12135555 in words is "twelve million, one hundred thirty-five thousand, five hundred fifty-five".