9898987853 has 2 divisors, whose sum is σ = 9898987854. Its totient is φ = 9898987852.

The previous prime is 9898987841. The next prime is 9898987877. The reversal of 9898987853 is 3587898989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9896668324 + 2319529 = 99482^2 + 1523^2 .

It is an emirp because it is prime and its reverse (3587898989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9898987853 - 2⁶ = 9898987789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9898987823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4949493926 + 4949493927.

It is an arithmetic number, because the mean of its divisors is an integer number (4949493927).

Almost surely, 2^9898987853 is an apocalyptic number.

It is an amenable number.

9898987853 is a deficient number, since it is larger than the sum of its proper divisors (1).

9898987853 is an equidigital number, since it uses as much as digits as its factorization.

9898987853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 313528320, while the sum is 74.

The square root of 9898987853 is about 99493.6573506070. The cubic root of 9898987853 is about 2147.1559910516.

The spelling of 9898987853 in words is "nine billion, eight hundred ninety-eight million, nine hundred eighty-seven thousand, eight hundred fifty-three".