999999901097 has 2 divisors, whose sum is σ = 999999901098. Its totient is φ = 999999901096.

The previous prime is 999999901039. The next prime is 999999901181. The reversal of 999999901097 is 790109999999.

999999901097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642080087401 + 357919813696 = 801299^2 + 598264^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999901097 - 2⁸ = 999999900841 is a prime.

It is not a weakly prime, because it can be changed into another prime (999999901297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999950548 + 499999950549.

It is an arithmetic number, because the mean of its divisors is an integer number (499999950549).

Almost surely, 2^999999901097 is an apocalyptic number.

It is an amenable number.

999999901097 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999901097 is an equidigital number, since it uses as much as digits as its factorization.

999999901097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 301327047, while the sum is 80.

The spelling of 999999901097 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred one thousand, ninety-seven".