551993 has 4 divisors (see below), whose sum is σ = 594468. Its totient is φ = 509520.

The previous prime is 551981. The next prime is 552001. The reversal of 551993 is 399155.

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

It can be written as a sum of positive squares in 2 ways, for example, as 369664 + 182329 = 608^2 + 427^2 .

It is a cyclic number.

It is not a de Polignac number, because 551993 - 2¹⁰ = 550969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (551933) 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, 21218 + ... + 21243.

It is an arithmetic number, because the mean of its divisors is an integer number (148617).

2⁵⁵¹⁹⁹³ is an apocalyptic number.

It is an amenable number.

551993 is a deficient number, since it is larger than the sum of its proper divisors (42475).

551993 is a wasteful number, since it uses less digits than its factorization.

551993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42474.

The product of its digits is 6075, while the sum is 32.

The square root of 551993 is about 742.9623139837. The cubic root of 551993 is about 82.0309718418.

It can be divided in two parts, 55 and 1993, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 551993 in words is "five hundred fifty-one thousand, nine hundred ninety-three".