55421885 has 4 divisors (see below), whose sum is σ = 66506268. Its totient is φ = 44337504.

The previous prime is 55421857. The next prime is 55421903. The reversal of 55421885 is 58812455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14730244 + 40691641 = 3838^2 + 6379^2 .

It is a cyclic number.

It is not a de Polignac number, because 55421885 - 2¹⁶ = 55356349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5542184 + ... + 5542193.

It is an arithmetic number, because the mean of its divisors is an integer number (16626567).

Almost surely, 2^55421885 is an apocalyptic number.

It is an amenable number.

55421885 is a deficient number, since it is larger than the sum of its proper divisors (11084383).

55421885 is a wasteful number, since it uses less digits than its factorization.

55421885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11084382.

The product of its digits is 64000, while the sum is 38.

The square root of 55421885 is about 7444.5876312930. The cubic root of 55421885 is about 381.2651392358.

The spelling of 55421885 in words is "fifty-five million, four hundred twenty-one thousand, eight hundred eighty-five".