551423 has 2 divisors, whose sum is σ = 551424. Its totient is φ = 551422.

The previous prime is 551407. The next prime is 551443. The reversal of 551423 is 324155.

It is an a-pointer prime, because the next prime (551443) can be obtained adding 551423 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551423 - 2⁴ = 551407 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 551395 and 551404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551443) 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 as a sum of consecutive naturals, namely, 275711 + 275712.

It is an arithmetic number, because the mean of its divisors is an integer number (275712).

551423 is a Friedman number, since it can be written as 55+(41*2)^3, using all its digits and the basic arithmetic operations.

2⁵⁵¹⁴²³ is an apocalyptic number.

551423 is a deficient number, since it is larger than the sum of its proper divisors (1).

551423 is an equidigital number, since it uses as much as digits as its factorization.

551423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 20.

The square root of 551423 is about 742.5786153668. The cubic root of 551423 is about 82.0027264610.

Adding to 551423 its reverse (324155), we get a palindrome (875578).

The spelling of 551423 in words is "five hundred fifty-one thousand, four hundred twenty-three".