551140 has 24 divisors (see below), whose sum is σ = 1226232. Its totient is φ = 207360.

The previous prime is 551129. The next prime is 551143. The reversal of 551140 is 41155.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 181476 + 369664 = 426^2 + 608^2 .

It is not an unprimeable number, because it can be changed into a prime (551143) by changing a digit.

551140 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471 + ... + 1150.

It is an arithmetic number, because the mean of its divisors is an integer number (51093).

2⁵⁵¹¹⁴⁰ is an apocalyptic number.

It is an amenable number.

551140 is an abundant number, since it is smaller than the sum of its proper divisors (675092).

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

551140 is a wasteful number, since it uses less digits than its factorization.

551140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647 (or 1645 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 551140 is about 742.3880386967. The cubic root of 551140 is about 81.9886956457.

Adding to 551140 its reverse (41155), we get a palindrome (592295).

The spelling of 551140 in words is "five hundred fifty-one thousand, one hundred forty".