55549973 has 6 divisors (see below), whose sum is σ = 56189154. Its totient is φ = 54917984.

The previous prime is 55549961. The next prime is 55549979. The reversal of 55549973 is 37994555.

It can be written as a sum of positive squares in 3 ways, for example, as 3378244 + 52171729 = 1838^2 + 7223^2 .

It is not a de Polignac number, because 55549973 - 2⁶ = 55549909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55549979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4415 + ... + 11427.

It is an arithmetic number, because the mean of its divisors is an integer number (9364859).

Almost surely, 2^55549973 is an apocalyptic number.

It is an amenable number.

55549973 is a deficient number, since it is larger than the sum of its proper divisors (639181).

55549973 is an frugal number, since it uses more digits than its factorization.

55549973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7191 (or 7102 counting only the distinct ones).

The product of its digits is 850500, while the sum is 47.

The square root of 55549973 is about 7453.1854263798. The cubic root of 55549973 is about 381.5586328946.

The spelling of 55549973 in words is "fifty-five million, five hundred forty-nine thousand, nine hundred seventy-three".