551553993 has 6 divisors (see below), whose sum is σ = 796689114. Its totient is φ = 367702656.

The previous prime is 551553973. The next prime is 551554027. The reversal of 551553993 is 399355155.

551553993 is a `hidden beast` number, since 5 + 5 + 1 + 553 + 9 + 93 = 666.

It can be written as a sum of positive squares in only one way, i.e., 514246329 + 37307664 = 22677^2 + 6108^2 .

It is not a de Polignac number, because 551553993 - 2¹³ = 551545801 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (551553973) 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, 30641880 + ... + 30641897.

It is an arithmetic number, because the mean of its divisors is an integer number (132781519).

Almost surely, 2^551553993 is an apocalyptic number.

It is an amenable number.

551553993 is a deficient number, since it is larger than the sum of its proper divisors (245135121).

551553993 is a wasteful number, since it uses less digits than its factorization.

551553993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61283783 (or 61283780 counting only the distinct ones).

The product of its digits is 455625, while the sum is 45.

The square root of 551553993 is about 23485.1866716022. The cubic root of 551553993 is about 820.0921931837.

The spelling of 551553993 in words is "five hundred fifty-one million, five hundred fifty-three thousand, nine hundred ninety-three".