99897989123 has 2 divisors, whose sum is σ = 99897989124. Its totient is φ = 99897989122.

The previous prime is 99897989057. The next prime is 99897989171. The reversal of 99897989123 is 32198979899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99897989123 - 2¹² = 99897985027 is a prime.

It is not a weakly prime, because it can be changed into another prime (99897989183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49948994561 + 49948994562.

It is an arithmetic number, because the mean of its divisors is an integer number (49948994562).

Almost surely, 2^99897989123 is an apocalyptic number.

99897989123 is a deficient number, since it is larger than the sum of its proper divisors (1).

99897989123 is an equidigital number, since it uses as much as digits as its factorization.

99897989123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158723712, while the sum is 74.

The spelling of 99897989123 in words is "ninety-nine billion, eight hundred ninety-seven million, nine hundred eighty-nine thousand, one hundred twenty-three".