551919 has 4 divisors (see below), whose sum is σ = 735896. Its totient is φ = 367944.

The previous prime is 551917. The next prime is 551927. The reversal of 551919 is 919155.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 551919 - 2¹ = 551917 is a prime.

It is a super-2 number, since 2×551919² = 609229165122, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91984 + ... + 91989.

It is an arithmetic number, because the mean of its divisors is an integer number (183974).

2⁵⁵¹⁹¹⁹ is an apocalyptic number.

551919 is a deficient number, since it is larger than the sum of its proper divisors (183977).

551919 is a wasteful number, since it uses less digits than its factorization.

551919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183976.

The product of its digits is 2025, while the sum is 30.

The square root of 551919 is about 742.9125116728. The cubic root of 551919 is about 82.0273059963.

Subtracting 551919 from its reverse (919155), we obtain a square (367236 = 606²).

The spelling of 551919 in words is "five hundred fifty-one thousand, nine hundred nineteen".