99897980909 has 2 divisors, whose sum is σ = 99897980910. Its totient is φ = 99897980908.

The previous prime is 99897980893. The next prime is 99897980921. The reversal of 99897980909 is 90908979899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98672630884 + 1225350025 = 314122^2 + 35005^2 .

It is a cyclic number.

It is not a de Polignac number, because 99897980909 - 2⁴ = 99897980893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99897980909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99897980999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49948990454 + 49948990455.

It is an arithmetic number, because the mean of its divisors is an integer number (49948990455).

Almost surely, 2^99897980909 is an apocalyptic number.

It is an amenable number.

99897980909 is a deficient number, since it is larger than the sum of its proper divisors (1).

99897980909 is an equidigital number, since it uses as much as digits as its factorization.

99897980909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238085568, while the sum is 77.

The spelling of 99897980909 in words is "ninety-nine billion, eight hundred ninety-seven million, nine hundred eighty thousand, nine hundred nine".