99191109389 has 2 divisors, whose sum is σ = 99191109390. Its totient is φ = 99191109388.

The previous prime is 99191109379. The next prime is 99191109461. The reversal of 99191109389 is 98390119199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71565345289 + 27625764100 = 267517^2 + 166210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99191109389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99191109379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49595554694 + 49595554695.

It is an arithmetic number, because the mean of its divisors is an integer number (49595554695).

Almost surely, 2^99191109389 is an apocalyptic number.

It is an amenable number.

99191109389 is a deficient number, since it is larger than the sum of its proper divisors (1).

99191109389 is an equidigital number, since it uses as much as digits as its factorization.

99191109389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1417176, while the sum is 59.

The spelling of 99191109389 in words is "ninety-nine billion, one hundred ninety-one million, one hundred nine thousand, three hundred eighty-nine".