9898987841 has 2 divisors, whose sum is σ = 9898987842. Its totient is φ = 9898987840.

The previous prime is 9898987823. The next prime is 9898987853. The reversal of 9898987841 is 1487898989.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7452696241 + 2446291600 = 86329^2 + 49460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9898987841 is a prime.

It is not a weakly prime, because it can be changed into another prime (9898987811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4949493920 + 4949493921.

It is an arithmetic number, because the mean of its divisors is an integer number (4949493921).

Almost surely, 2^9898987841 is an apocalyptic number.

It is an amenable number.

9898987841 is a deficient number, since it is larger than the sum of its proper divisors (1).

9898987841 is an equidigital number, since it uses as much as digits as its factorization.

9898987841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 83607552, while the sum is 71.

The square root of 9898987841 is about 99493.6572903017. The cubic root of 9898987841 is about 2147.1559901840.

The spelling of 9898987841 in words is "nine billion, eight hundred ninety-eight million, nine hundred eighty-seven thousand, eight hundred forty-one".