99889551 has 8 divisors (see below), whose sum is σ = 147984560. Its totient is φ = 66593016.

The previous prime is 99889549. The next prime is 99889561. The reversal of 99889551 is 15598899.

99889551 is a `hidden beast` number, since 9 + 9 + 8 + 89 + 551 = 666.

It is not a de Polignac number, because 99889551 - 2¹ = 99889549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99889541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1849780 + ... + 1849833.

It is an arithmetic number, because the mean of its divisors is an integer number (18498070).

Almost surely, 2^99889551 is an apocalyptic number.

99889551 is a deficient number, since it is larger than the sum of its proper divisors (48095009).

99889551 is a wasteful number, since it uses less digits than its factorization.

99889551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3699622 (or 3699616 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 54.

The square root of 99889551 is about 9994.4760242846. The cubic root of 99889551 is about 463.9879341269.

The spelling of 99889551 in words is "ninety-nine million, eight hundred eighty-nine thousand, five hundred fifty-one".