551659 has 2 divisors, whose sum is σ = 551660. Its totient is φ = 551658.

The previous prime is 551653. The next prime is 551671. The reversal of 551659 is 956155.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551659 - 2³ = 551651 is a prime.

551659 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 551659.

It is not a weakly prime, because it can be changed into another prime (551651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275829 + 275830.

It is an arithmetic number, because the mean of its divisors is an integer number (275830).

2⁵⁵¹⁶⁵⁹ is an apocalyptic number.

551659 is a deficient number, since it is larger than the sum of its proper divisors (1).

551659 is an equidigital number, since it uses as much as digits as its factorization.

551659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 31.

The square root of 551659 is about 742.7375041022. The cubic root of 551659 is about 82.0144233998.

Subtracting 551659 from its reverse (956155), we obtain a square (404496 = 636²).

The spelling of 551659 in words is "five hundred fifty-one thousand, six hundred fifty-nine".