551638 has 8 divisors (see below), whose sum is σ = 856080. Its totient is φ = 266280.

The previous prime is 551597. The next prime is 551651. The reversal of 551638 is 836155.

551638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent number.

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, 4698 + ... + 4813.

It is an arithmetic number, because the mean of its divisors is an integer number (107010).

2⁵⁵¹⁶³⁸ is an apocalyptic number.

551638 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

551638 is a deficient number, since it is larger than the sum of its proper divisors (304442).

551638 is a wasteful number, since it uses less digits than its factorization.

551638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9542.

The product of its digits is 3600, while the sum is 28.

The square root of 551638 is about 742.7233670755. The cubic root of 551638 is about 82.0133827057.

The spelling of 551638 in words is "five hundred fifty-one thousand, six hundred thirty-eight".