551566 has 4 divisors (see below), whose sum is σ = 827352. Its totient is φ = 275782.

The previous prime is 551557. The next prime is 551569. The reversal of 551566 is 665155.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137890 + ... + 137893.

It is an arithmetic number, because the mean of its divisors is an integer number (206838).

2⁵⁵¹⁵⁶⁶ is an apocalyptic number.

551566 is a deficient number, since it is larger than the sum of its proper divisors (275786).

551566 is a wasteful number, since it uses less digits than its factorization.

551566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275785.

The product of its digits is 4500, while the sum is 28.

The square root of 551566 is about 742.6748952267. The cubic root of 551566 is about 82.0098144112.

The spelling of 551566 in words is "five hundred fifty-one thousand, five hundred sixty-six".