55135121 has 4 divisors (see below), whose sum is σ = 55911744. Its totient is φ = 54358500.

The previous prime is 55135111. The next prime is 55135123. The reversal of 55135121 is 12153155.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 55135121 - 2¹⁰ = 55134097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55135123) 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, 388205 + ... + 388346.

It is an arithmetic number, because the mean of its divisors is an integer number (13977936).

Almost surely, 2^55135121 is an apocalyptic number.

It is an amenable number.

55135121 is a deficient number, since it is larger than the sum of its proper divisors (776623).

55135121 is an equidigital number, since it uses as much as digits as its factorization.

55135121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776622.

The product of its digits is 750, while the sum is 23.

The square root of 55135121 is about 7425.3027547703. The cubic root of 55135121 is about 380.6064209283.

Adding to 55135121 its reverse (12153155), we get a palindrome (67288276).

The spelling of 55135121 in words is "fifty-five million, one hundred thirty-five thousand, one hundred twenty-one".