999999000551 has 2 divisors, whose sum is σ = 999999000552. Its totient is φ = 999999000550.

The previous prime is 999999000547. The next prime is 999999000571. The reversal of 999999000551 is 155000999999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999999000551 - 2² = 999999000547 is a prime.

It is a super-2 number, since 2×999999000551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999000521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999500275 + 499999500276.

It is an arithmetic number, because the mean of its divisors is an integer number (499999500276).

Almost surely, 2^999999000551 is an apocalyptic number.

999999000551 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999000551 is an equidigital number, since it uses as much as digits as its factorization.

999999000551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13286025, while the sum is 65.

The spelling of 999999000551 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, five hundred fifty-one", and thus it is an aban number.