55621003 has 4 divisors (see below), whose sum is σ = 56171808. Its totient is φ = 55070200.

The previous prime is 55620949. The next prime is 55621019. The reversal of 55621003 is 30012655.

It is a happy number.

55621003 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.

It is a cyclic number.

It is not a de Polignac number, because 55621003 - 2¹³ = 55612811 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55621063) 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, 275251 + ... + 275452.

It is an arithmetic number, because the mean of its divisors is an integer number (14042952).

Almost surely, 2^55621003 is an apocalyptic number.

55621003 is a deficient number, since it is larger than the sum of its proper divisors (550805).

55621003 is a wasteful number, since it uses less digits than its factorization.

55621003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550804.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 55621003 is about 7457.9489807855. The cubic root of 55621003 is about 381.7211926277.

Adding to 55621003 its reverse (30012655), we get a palindrome (85633658).

The spelling of 55621003 in words is "fifty-five million, six hundred twenty-one thousand, three".