99109878929 has 2 divisors, whose sum is σ = 99109878930. Its totient is φ = 99109878928.

The previous prime is 99109878859. The next prime is 99109878947. The reversal of 99109878929 is 92987890199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83551058704 + 15558820225 = 289052^2 + 124735^2 .

It is a cyclic number.

It is not a de Polignac number, because 99109878929 - 2¹⁶ = 99109813393 is a prime.

It is not a weakly prime, because it can be changed into another prime (99109178929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49554939464 + 49554939465.

It is an arithmetic number, because the mean of its divisors is an integer number (49554939465).

Almost surely, 2^99109878929 is an apocalyptic number.

It is an amenable number.

99109878929 is a deficient number, since it is larger than the sum of its proper divisors (1).

99109878929 is an equidigital number, since it uses as much as digits as its factorization.

99109878929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52907904, while the sum is 71.

The spelling of 99109878929 in words is "ninety-nine billion, one hundred nine million, eight hundred seventy-eight thousand, nine hundred twenty-nine".