55163281 has 4 divisors (see below), whose sum is σ = 56446192. Its totient is φ = 53880372.

The previous prime is 55163267. The next prime is 55163321. The reversal of 55163281 is 18236155.

55163281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55163281 - 2¹⁵ = 55130513 is a prime.

It is a super-2 number, since 2×55163281² = 6085975141369922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55163201) 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, 641391 + ... + 641476.

It is an arithmetic number, because the mean of its divisors is an integer number (14111548).

Almost surely, 2^55163281 is an apocalyptic number.

It is an amenable number.

55163281 is a deficient number, since it is larger than the sum of its proper divisors (1282911).

55163281 is a wasteful number, since it uses less digits than its factorization.

55163281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282910.

The product of its digits is 7200, while the sum is 31.

The square root of 55163281 is about 7427.1987316888. The cubic root of 55163281 is about 380.6712075377.

The spelling of 55163281 in words is "fifty-five million, one hundred sixty-three thousand, two hundred eighty-one".