129308085 has 12 divisors (see below), whose sum is σ = 224134092. Its totient is φ = 68964288.

The previous prime is 129308083. The next prime is 129308087. The reversal of 129308085 is 580803921.

It is an interprime number because it is at equal distance from previous prime (129308083) and next prime (129308087).

It can be written as a sum of positive squares in 2 ways, for example, as 75637809 + 53670276 = 8697^2 + 7326^2 .

It is not a de Polignac number, because 129308085 - 2¹ = 129308083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129308083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1436712 + ... + 1436801.

It is an arithmetic number, because the mean of its divisors is an integer number (18677841).

Almost surely, 2^129308085 is an apocalyptic number.

129308085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129308085 is a deficient number, since it is larger than the sum of its proper divisors (94826007).

129308085 is a wasteful number, since it uses less digits than its factorization.

129308085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873524 (or 2873521 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 129308085 is about 11371.3712893389. The cubic root of 129308085 is about 505.6793588483.

The spelling of 129308085 in words is "one hundred twenty-nine million, three hundred eight thousand, eighty-five".