9898987851 has 12 divisors (see below), whose sum is σ = 15139628712. Its totient is φ = 6211129536.

The previous prime is 9898987841. The next prime is 9898987853. The reversal of 9898987851 is 1587898989.

It is not a de Polignac number, because 9898987851 - 2⁷ = 9898987723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9898987851.

It is not an unprimeable number, because it can be changed into a prime (9898987853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32349481 + ... + 32349786.

It is an arithmetic number, because the mean of its divisors is an integer number (1261635726).

Almost surely, 2^9898987851 is an apocalyptic number.

9898987851 is a deficient number, since it is larger than the sum of its proper divisors (5240640861).

9898987851 is a wasteful number, since it uses less digits than its factorization.

9898987851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64699290 (or 64699287 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 72.

The square root of 9898987851 is about 99493.6573405561. The cubic root of 9898987851 is about 2147.1559909070.

The spelling of 9898987851 in words is "nine billion, eight hundred ninety-eight million, nine hundred eighty-seven thousand, eight hundred fifty-one".