551669 has 4 divisors (see below), whose sum is σ = 553644. Its totient is φ = 549696.

The previous prime is 551659. The next prime is 551671. The reversal of 551669 is 966155.

Added to its reverse (966155) it gives a square (1517824 = 1232²).

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68644 + 483025 = 262^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 551669 - 2⁴ = 551653 is a prime.

It is a super-2 number, since 2×551669² = 608677371122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551659) 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 in 3 ways as a sum of consecutive naturals, for example, 482 + ... + 1155.

It is an arithmetic number, because the mean of its divisors is an integer number (138411).

2⁵⁵¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

551669 is a deficient number, since it is larger than the sum of its proper divisors (1975).

551669 is a wasteful number, since it uses less digits than its factorization.

551669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974.

The product of its digits is 8100, while the sum is 32.

The square root of 551669 is about 742.7442359251. The cubic root of 551669 is about 82.0149189591.

Adding to 551669 its reverse (966155), we get a square (1517824 = 1232²).

The spelling of 551669 in words is "five hundred fifty-one thousand, six hundred sixty-nine".