9909199397 has 2 divisors, whose sum is σ = 9909199398. Its totient is φ = 9909199396.

The previous prime is 9909199379. The next prime is 9909199441. The reversal of 9909199397 is 7939919099.

9909199397 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (9909199379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5354434276 + 4554765121 = 73174^2 + 67489^2 .

It is a cyclic number.

It is not a de Polignac number, because 9909199397 - 2¹⁸ = 9908937253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9909199367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4954599698 + 4954599699.

It is an arithmetic number, because the mean of its divisors is an integer number (4954599699).

Almost surely, 2^9909199397 is an apocalyptic number.

It is an amenable number.

9909199397 is a deficient number, since it is larger than the sum of its proper divisors (1).

9909199397 is an equidigital number, since it uses as much as digits as its factorization.

9909199397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11160261, while the sum is 65.

The square root of 9909199397 is about 99544.9616856624. The cubic root of 9909199397 is about 2147.8940544833.

The spelling of 9909199397 in words is "nine billion, nine hundred nine million, one hundred ninety-nine thousand, three hundred ninety-seven".