551055999 has 48 divisors (see below), whose sum is σ = 837581472. Its totient is φ = 320226816.

The previous prime is 551055991. The next prime is 551056001. The reversal of 551055999 is 999550155.

It is not a de Polignac number, because 551055999 - 2³ = 551055991 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551055991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1738189 + ... + 1738505.

It is an arithmetic number, because the mean of its divisors is an integer number (17449614).

Almost surely, 2^551055999 is an apocalyptic number.

551055999 is a deficient number, since it is larger than the sum of its proper divisors (286525473).

551055999 is a wasteful number, since it uses less digits than its factorization.

551055999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 455625, while the sum is 48.

The square root of 551055999 is about 23474.5819771088. The cubic root of 551055999 is about 819.8453004814.

The spelling of 551055999 in words is "five hundred fifty-one million, fifty-five thousand, nine hundred ninety-nine".