551979643 has 2 divisors, whose sum is σ = 551979644. Its totient is φ = 551979642.

The previous prime is 551979641. The next prime is 551979671. The reversal of 551979643 is 346979155.

551979643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551979643 - 2¹ = 551979641 is a prime.

Together with 551979641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (551979641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275989821 + 275989822.

It is an arithmetic number, because the mean of its divisors is an integer number (275989822).

Almost surely, 2^551979643 is an apocalyptic number.

551979643 is a deficient number, since it is larger than the sum of its proper divisors (1).

551979643 is an equidigital number, since it uses as much as digits as its factorization.

551979643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1020600, while the sum is 49.

The square root of 551979643 is about 23494.2470192173. The cubic root of 551979643 is about 820.3031018095.

The spelling of 551979643 in words is "five hundred fifty-one million, nine hundred seventy-nine thousand, six hundred forty-three".