551945993 has 4 divisors (see below), whose sum is σ = 552467268. Its totient is φ = 551424720.

The previous prime is 551945959. The next prime is 551946013. The reversal of 551945993 is 399549155.

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 162001984 + 389944009 = 12728^2 + 19747^2 .

It is a cyclic number.

It is not a de Polignac number, because 551945993 - 2⁶ = 551945929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551941993) 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, 259046 + ... + 261167.

It is an arithmetic number, because the mean of its divisors is an integer number (138116817).

Almost surely, 2^551945993 is an apocalyptic number.

It is an amenable number.

551945993 is a deficient number, since it is larger than the sum of its proper divisors (521275).

551945993 is a wasteful number, since it uses less digits than its factorization.

551945993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521274.

The product of its digits is 1093500, while the sum is 50.

The square root of 551945993 is about 23493.5308755410. The cubic root of 551945993 is about 820.2864322574.

The spelling of 551945993 in words is "five hundred fifty-one million, nine hundred forty-five thousand, nine hundred ninety-three".