551878 has 4 divisors (see below), whose sum is σ = 827820. Its totient is φ = 275938.

The previous prime is 551861. The next prime is 551909. The reversal of 551878 is 878155.

551878 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 an emirpimes, since its reverse is a distinct semiprime: 878155 = 5 ⋅175631.

It is a congruent number.

It is an unprimeable number.

551878 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 as a sum of consecutive naturals, namely, 137968 + ... + 137971.

It is an arithmetic number, because the mean of its divisors is an integer number (206955).

2⁵⁵¹⁸⁷⁸ is an apocalyptic number.

551878 is a deficient number, since it is larger than the sum of its proper divisors (275942).

551878 is a wasteful number, since it uses less digits than its factorization.

551878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275941.

The product of its digits is 11200, while the sum is 34.

The square root of 551878 is about 742.8849170632. The cubic root of 551878 is about 82.0252747787.

The spelling of 551878 in words is "five hundred fifty-one thousand, eight hundred seventy-eight".