551620 has 12 divisors (see below), whose sum is σ = 1158444. Its totient is φ = 220640.

The previous prime is 551597. The next prime is 551651. The reversal of 551620 is 26155.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 427716 + 123904 = 654^2 + 352^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13771 + ... + 13810.

It is an arithmetic number, because the mean of its divisors is an integer number (96537).

2⁵⁵¹⁶²⁰ is an apocalyptic number.

It is an amenable number.

551620 is an abundant number, since it is smaller than the sum of its proper divisors (606824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551620 is a wasteful number, since it uses less digits than its factorization.

551620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27590 (or 27588 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 551620 is about 742.7112494099. The cubic root of 551620 is about 82.0124906612.

Adding to 551620 its reverse (26155), we get a palindrome (577775).

The spelling of 551620 in words is "five hundred fifty-one thousand, six hundred twenty".