551613 has 4 divisors (see below), whose sum is σ = 735488. Its totient is φ = 367740.

The previous prime is 551597. The next prime is 551651. The reversal of 551613 is 316155.

It is a happy number.

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.

It is not a de Polignac number, because 551613 - 2⁴ = 551597 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 551613.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 551613.

It is not an unprimeable number, because it can be changed into a prime (551653) 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 3 ways as a sum of consecutive naturals, for example, 91933 + ... + 91938.

It is an arithmetic number, because the mean of its divisors is an integer number (183872).

2⁵⁵¹⁶¹³ is an apocalyptic number.

It is an amenable number.

551613 is a deficient number, since it is larger than the sum of its proper divisors (183875).

551613 is a wasteful number, since it uses less digits than its factorization.

551613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183874.

The product of its digits is 450, while the sum is 21.

The square root of 551613 is about 742.7065369310. The cubic root of 551613 is about 82.0121437498.

Adding to 551613 its reverse (316155), we get a palindrome (867768).

The spelling of 551613 in words is "five hundred fifty-one thousand, six hundred thirteen".