99129871 has 2 divisors, whose sum is σ = 99129872. Its totient is φ = 99129870.

The previous prime is 99129869. The next prime is 99129913. The reversal of 99129871 is 17892199.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99129871 - 2¹ = 99129869 is a prime.

Together with 99129869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99129851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49564935 + 49564936.

It is an arithmetic number, because the mean of its divisors is an integer number (49564936).

Almost surely, 2^99129871 is an apocalyptic number.

99129871 is a deficient number, since it is larger than the sum of its proper divisors (1).

99129871 is an equidigital number, since it uses as much as digits as its factorization.

99129871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 46.

The square root of 99129871 is about 9956.3984954400. The cubic root of 99129871 is about 462.8086992914.

It can be divided in two parts, 99129 and 871, that added together give a 5-th power (100000 = 10⁵).

The spelling of 99129871 in words is "ninety-nine million, one hundred twenty-nine thousand, eight hundred seventy-one".