551623 has 4 divisors (see below), whose sum is σ = 560728. Its totient is φ = 542520.

The previous prime is 551597. The next prime is 551651. The reversal of 551623 is 326155.

It is a happy number.

551623 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 551623 - 2¹⁷ = 420551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 551594 and 551603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551653) 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, 4461 + ... + 4582.

It is an arithmetic number, because the mean of its divisors is an integer number (140182).

2⁵⁵¹⁶²³ is an apocalyptic number.

551623 is a deficient number, since it is larger than the sum of its proper divisors (9105).

551623 is an equidigital number, since it uses as much as digits as its factorization.

551623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9104.

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

The square root of 551623 is about 742.7132690346. The cubic root of 551623 is about 82.0126393366.

Adding to 551623 its reverse (326155), we get a palindrome (877778).

The spelling of 551623 in words is "five hundred fifty-one thousand, six hundred twenty-three".