9807138899 has 2 divisors, whose sum is σ = 9807138900. Its totient is φ = 9807138898.

The previous prime is 9807138893. The next prime is 9807138941. The reversal of 9807138899 is 9988317089.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9807138899 - 2⁸ = 9807138643 is a prime.

It is not a weakly prime, because it can be changed into another prime (9807138893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4903569449 + 4903569450.

It is an arithmetic number, because the mean of its divisors is an integer number (4903569450).

Almost surely, 2^9807138899 is an apocalyptic number.

9807138899 is a deficient number, since it is larger than the sum of its proper divisors (1).

9807138899 is an equidigital number, since it uses as much as digits as its factorization.

9807138899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 62.

The square root of 9807138899 is about 99030.9996869667. Note that the first 3 decimals coincide. The cubic root of 9807138899 is about 2140.4944630702.

Adding to 9807138899 its sum of digits (62), we get a square (9807138961 = 99031²).

The spelling of 9807138899 in words is "nine billion, eight hundred seven million, one hundred thirty-eight thousand, eight hundred ninety-nine".