551689 has 2 divisors, whose sum is σ = 551690. Its totient is φ = 551688.

The previous prime is 551671. The next prime is 551693. The reversal of 551689 is 986155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 537289 + 14400 = 733^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 551689 - 2¹¹ = 549641 is a prime.

It is not a weakly prime, because it can be changed into another prime (551659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275844 + 275845.

It is an arithmetic number, because the mean of its divisors is an integer number (275845).

2⁵⁵¹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

551689 is a deficient number, since it is larger than the sum of its proper divisors (1).

551689 is an equidigital number, since it uses as much as digits as its factorization.

551689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The square root of 551689 is about 742.7576993879. The cubic root of 551689 is about 82.0159100598.

The spelling of 551689 in words is "five hundred fifty-one thousand, six hundred eighty-nine".