551917 has 2 divisors, whose sum is σ = 551918. Its totient is φ = 551916.

The previous prime is 551911. The next prime is 551927. The reversal of 551917 is 719155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 491401 + 60516 = 701^2 + 246^2 .

It is a cyclic number.

It is not a de Polignac number, because 551917 - 2³ = 551909 is a prime.

It is a super-2 number, since 2×551917² = 609224749778, which contains 22 as substring.

It is a Chen prime.

551917 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275958 + 275959.

It is an arithmetic number, because the mean of its divisors is an integer number (275959).

2⁵⁵¹⁹¹⁷ is an apocalyptic number.

It is an amenable number.

551917 is a deficient number, since it is larger than the sum of its proper divisors (1).

551917 is an equidigital number, since it uses as much as digits as its factorization.

551917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1575, while the sum is 28.

The square root of 551917 is about 742.9111656181. The cubic root of 551917 is about 82.0272069149.

The spelling of 551917 in words is "five hundred fifty-one thousand, nine hundred seventeen".