551911 has 2 divisors, whose sum is σ = 551912. Its totient is φ = 551910.

The previous prime is 551909. The next prime is 551917. The reversal of 551911 is 119155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551911 - 2¹ = 551909 is a prime.

Together with 551909, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275955 + 275956.

It is an arithmetic number, because the mean of its divisors is an integer number (275956).

2⁵⁵¹⁹¹¹ is an apocalyptic number.

551911 is a deficient number, since it is larger than the sum of its proper divisors (1).

551911 is an equidigital number, since it uses as much as digits as its factorization.

551911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225, while the sum is 22.

The square root of 551911 is about 742.9071274392. The cubic root of 551911 is about 82.0269096691.

The spelling of 551911 in words is "five hundred fifty-one thousand, nine hundred eleven".