551985 has 24 divisors (see below), whose sum is σ = 1028736. Its totient is φ = 252000.

The previous prime is 551981. The next prime is 552001. The reversal of 551985 is 589155.

It is not a de Polignac number, because 551985 - 2² = 551981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 360 + ... + 1110.

It is an arithmetic number, because the mean of its divisors is an integer number (42864).

2⁵⁵¹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

551985 is a deficient number, since it is larger than the sum of its proper divisors (476751).

551985 is a wasteful number, since it uses less digits than its factorization.

551985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 766 counting only the distinct ones).

The product of its digits is 9000, while the sum is 33.

The square root of 551985 is about 742.9569301110. The cubic root of 551985 is about 82.0305755500.

The spelling of 551985 in words is "five hundred fifty-one thousand, nine hundred eighty-five".