551916 has 18 divisors (see below), whose sum is σ = 1395212. Its totient is φ = 183960.

The previous prime is 551911. The next prime is 551917. The reversal of 551916 is 619155.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×551916² = 609222542112, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 551916.

It is not an unprimeable number, because it can be changed into a prime (551911) by changing a digit.

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, 7630 + ... + 7701.

2⁵⁵¹⁹¹⁶ is an apocalyptic number.

It is an amenable number.

551916 is an abundant number, since it is smaller than the sum of its proper divisors (843296).

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

551916 is a wasteful number, since it uses less digits than its factorization.

551916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15341 (or 15336 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 551916 is about 742.9104925898. The cubic root of 551916 is about 82.0271573740.

The spelling of 551916 in words is "five hundred fifty-one thousand, nine hundred sixteen".