9999990097 has 2 divisors, whose sum is σ = 9999990098. Its totient is φ = 9999990096.

The previous prime is 9999990017. The next prime is 9999990107. The reversal of 9999990097 is 7900999999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9999800001 + 190096 = 99999^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999990097 - 2¹¹ = 9999988049 is a prime.

It is not a weakly prime, because it can be changed into another prime (9999990017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999995048 + 4999995049.

It is an arithmetic number, because the mean of its divisors is an integer number (4999995049).

Almost surely, 2^9999990097 is an apocalyptic number.

It is an amenable number.

9999990097 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999990097 is an equidigital number, since it uses as much as digits as its factorization.

9999990097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33480783, while the sum is 70.

The square root of 9999990097 is about 99999.9504849877. The cubic root of 9999990097 is about 2154.4339788528.

It can be divided in two parts, 99999 and 90097, that added together give a square (190096 = 436²).

The spelling of 9999990097 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety thousand, ninety-seven".