551557 has 2 divisors, whose sum is σ = 551558. Its totient is φ = 551556.

The previous prime is 551549. The next prime is 551569. The reversal of 551557 is 755155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 516961 + 34596 = 719^2 + 186^2 .

It is a cyclic number.

It is not a de Polignac number, because 551557 - 2³ = 551549 is a prime.

551557 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275778 + 275779.

It is an arithmetic number, because the mean of its divisors is an integer number (275779).

2⁵⁵¹⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

551557 is a deficient number, since it is larger than the sum of its proper divisors (1).

551557 is an equidigital number, since it uses as much as digits as its factorization.

551557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4375, while the sum is 28.

The square root of 551557 is about 742.6688360232. The cubic root of 551557 is about 82.0093683526.

The spelling of 551557 in words is "five hundred fifty-one thousand, five hundred fifty-seven".