9681399898 has 4 divisors (see below), whose sum is σ = 14522099850. Its totient is φ = 4840699948.

The previous prime is 9681399869. The next prime is 9681399899. The reversal of 9681399898 is 8989931869.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8998988769 + 682411129 = 94863^2 + 26123^2 .

It is not an unprimeable number, because it can be changed into a prime (9681399899) 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 as a sum of consecutive naturals, namely, 2420349973 + ... + 2420349976.

Almost surely, 2^9681399898 is an apocalyptic number.

9681399898 is a deficient number, since it is larger than the sum of its proper divisors (4840699952).

9681399898 is a wasteful number, since it uses less digits than its factorization.

9681399898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840699951.

The product of its digits is 60466176, while the sum is 70.

The square root of 9681399898 is about 98394.1049961836. The cubic root of 9681399898 is about 2131.3072051128.

The spelling of 9681399898 in words is "nine billion, six hundred eighty-one million, three hundred ninety-nine thousand, eight hundred ninety-eight".