55521873 has 12 divisors (see below), whose sum is σ = 87489168. Its totient is φ = 33649560.

The previous prime is 55521859. The next prime is 55521883. The reversal of 55521873 is 37812555.

55521873 is a `hidden beast` number, since 55 + 521 + 87 + 3 = 666.

55521873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55521873 - 2¹⁶ = 55456337 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (55521883) 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 11 ways as a sum of consecutive naturals, for example, 280315 + ... + 280512.

It is an arithmetic number, because the mean of its divisors is an integer number (7290764).

Almost surely, 2^55521873 is an apocalyptic number.

It is an amenable number.

55521873 is a deficient number, since it is larger than the sum of its proper divisors (31967295).

55521873 is a wasteful number, since it uses less digits than its factorization.

55521873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560844 (or 560841 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 55521873 is about 7451.3000879041. The cubic root of 55521873 is about 381.4942847927.

The spelling of 55521873 in words is "fifty-five million, five hundred twenty-one thousand, eight hundred seventy-three".