55144181 has 4 divisors (see below), whose sum is σ = 55161600. Its totient is φ = 55126764.

The previous prime is 55144169. The next prime is 55144211. The reversal of 55144181 is 18144155.

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 a de Polignac number, because none of the positive numbers 2^k-55144181 is a prime.

It is a super-2 number, since 2×55144181² = 6081761396321522, 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 (55144151) 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, 2471 + ... + 10788.

It is an arithmetic number, because the mean of its divisors is an integer number (13790400).

Almost surely, 2^55144181 is an apocalyptic number.

It is an amenable number.

55144181 is a deficient number, since it is larger than the sum of its proper divisors (17419).

55144181 is a wasteful number, since it uses less digits than its factorization.

55144181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17418.

The product of its digits is 3200, while the sum is 29.

The square root of 55144181 is about 7425.9128058441. The cubic root of 55144181 is about 380.6272673220.

The spelling of 55144181 in words is "fifty-five million, one hundred forty-four thousand, one hundred eighty-one".