551109987 has 20 divisors (see below), whose sum is σ = 843347736. Its totient is φ = 358443360.

The previous prime is 551109959. The next prime is 551110013. The reversal of 551109987 is 789901155.

551109987 is a `hidden beast` number, since 551 + 1 + 0 + 9 + 98 + 7 = 666.

It is not a de Polignac number, because 551109987 - 2⁸ = 551109731 is a prime.

It is a super-2 number, since 2×551109987² = 607444435542280338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (551109947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 79653 + ... + 86294.

Almost surely, 2^551109987 is an apocalyptic number.

551109987 is a deficient number, since it is larger than the sum of its proper divisors (292237749).

551109987 is a wasteful number, since it uses less digits than its factorization.

551109987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166000 (or 165991 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 45.

The square root of 551109987 is about 23475.7318735753. The cubic root of 551109987 is about 819.8720735394.

The spelling of 551109987 in words is "five hundred fifty-one million, one hundred nine thousand, nine hundred eighty-seven".