55544621 has 4 divisors (see below), whose sum is σ = 60594144. Its totient is φ = 50495100.

The previous prime is 55544611. The next prime is 55544623. The reversal of 55544621 is 12644555.

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 55544621 - 2⁶ = 55544557 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 (55544623) 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, 2524745 + ... + 2524766.

It is an arithmetic number, because the mean of its divisors is an integer number (15148536).

Almost surely, 2^55544621 is an apocalyptic number.

It is an amenable number.

55544621 is a deficient number, since it is larger than the sum of its proper divisors (5049523).

55544621 is a wasteful number, since it uses less digits than its factorization.

55544621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5049522.

The product of its digits is 24000, while the sum is 32.

The square root of 55544621 is about 7452.8263766171. The cubic root of 55544621 is about 381.5463786589.

It can be divided in two parts, 55544 and 621, that added together give a palindrome (56165).

The spelling of 55544621 in words is "fifty-five million, five hundred forty-four thousand, six hundred twenty-one".