551649993 has 4 divisors (see below), whose sum is σ = 735533328. Its totient is φ = 367766660.

The previous prime is 551649947. The next prime is 551649997. The reversal of 551649993 is 399946155.

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 a cyclic number.

It is not a de Polignac number, because 551649993 - 2¹⁴ = 551633609 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (551649997) 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, 91941663 + ... + 91941668.

It is an arithmetic number, because the mean of its divisors is an integer number (183883332).

Almost surely, 2^551649993 is an apocalyptic number.

It is an amenable number.

551649993 is a deficient number, since it is larger than the sum of its proper divisors (183883335).

551649993 is a wasteful number, since it uses less digits than its factorization.

551649993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183883334.

The product of its digits is 1312200, while the sum is 51.

The square root of 551649993 is about 23487.2304242114. The cubic root of 551649993 is about 820.1397704438.

The spelling of 551649993 in words is "five hundred fifty-one million, six hundred forty-nine thousand, nine hundred ninety-three".