99999191807 has 2 divisors, whose sum is σ = 99999191808. Its totient is φ = 99999191806.

The previous prime is 99999191771. The next prime is 99999191819. The reversal of 99999191807 is 70819199999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99999191807 - 2¹² = 99999187711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99999190807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999595903 + 49999595904.

It is an arithmetic number, because the mean of its divisors is an integer number (49999595904).

Almost surely, 2^99999191807 is an apocalyptic number.

99999191807 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999191807 is an equidigital number, since it uses as much as digits as its factorization.

99999191807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29760696, while the sum is 71.

The spelling of 99999191807 in words is "ninety-nine billion, nine hundred ninety-nine million, one hundred ninety-one thousand, eight hundred seven".