551857 has 4 divisors (see below), whose sum is σ = 555120. Its totient is φ = 548596.

The previous prime is 551849. The next prime is 551861. The reversal of 551857 is 758155.

551857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 758155 = 5 ⋅151631.

It is a cyclic number.

It is not a de Polignac number, because 551857 - 2³ = 551849 is a prime.

It is a super-2 number, since 2×551857² = 609092296898, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1363 + ... + 1720.

It is an arithmetic number, because the mean of its divisors is an integer number (138780).

2⁵⁵¹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

551857 is a deficient number, since it is larger than the sum of its proper divisors (3263).

551857 is a wasteful number, since it uses less digits than its factorization.

551857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3262.

The product of its digits is 7000, while the sum is 31.

The square root of 551857 is about 742.8707828418. The cubic root of 551857 is about 82.0242343600.

The spelling of 551857 in words is "five hundred fifty-one thousand, eight hundred fifty-seven".