551009999 has 8 divisors (see below), whose sum is σ = 563675328. Its totient is φ = 538384000.

The previous prime is 551009971. The next prime is 551010037. The reversal of 551009999 is 999900155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 551009999 - 2⁸ = 551009743 is a prime.

It is a super-2 number, since 2×551009999² = 607224037995960002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551009939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19499 + ... + 38499.

It is an arithmetic number, because the mean of its divisors is an integer number (70459416).

Almost surely, 2^551009999 is an apocalyptic number.

551009999 is a deficient number, since it is larger than the sum of its proper divisors (12665329).

551009999 is a wasteful number, since it uses less digits than its factorization.

551009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19665.

The product of its (nonzero) digits is 164025, while the sum is 47.

The square root of 551009999 is about 23473.6021735055. The cubic root of 551009999 is about 819.8224873533.

The spelling of 551009999 in words is "five hundred fifty-one million, nine thousand, nine hundred ninety-nine".