551900 has 18 divisors (see below), whose sum is σ = 1197840. Its totient is φ = 220720.

The previous prime is 551861. The next prime is 551909. The reversal of 551900 is 9155.

It is a super-2 number, since 2×551900² = 609187220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551909) by changing a digit.

551900 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 2660 + ... + 2859.

2⁵⁵¹⁹⁰⁰ is an apocalyptic number.

551900 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

551900 is an abundant number, since it is smaller than the sum of its proper divisors (645940).

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

551900 is a wasteful number, since it uses less digits than its factorization.

551900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5533 (or 5526 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 551900 is about 742.8997240543. The cubic root of 551900 is about 82.0263647128.

The spelling of 551900 in words is "five hundred fifty-one thousand, nine hundred".