551443 has 2 divisors, whose sum is σ = 551444. Its totient is φ = 551442.

The previous prime is 551423. The next prime is 551461. The reversal of 551443 is 344155.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551443 is a prime.

551443 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (551423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275721 + 275722.

It is an arithmetic number, because the mean of its divisors is an integer number (275722).

2⁵⁵¹⁴⁴³ is an apocalyptic number.

551443 is a deficient number, since it is larger than the sum of its proper divisors (1).

551443 is an equidigital number, since it uses as much as digits as its factorization.

551443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 22.

The square root of 551443 is about 742.5920818323. The cubic root of 551443 is about 82.0037178564.

Adding to 551443 its reverse (344155), we get a palindrome (895598).

The spelling of 551443 in words is "five hundred fifty-one thousand, four hundred forty-three".