129971085 has 8 divisors (see below), whose sum is σ = 207953760. Its totient is φ = 69317904.

The previous prime is 129971071. The next prime is 129971087. The reversal of 129971085 is 580179921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129971085 - 2⁷ = 129970957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129971087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4332355 + ... + 4332384.

It is an arithmetic number, because the mean of its divisors is an integer number (25994220).

Almost surely, 2^129971085 is an apocalyptic number.

129971085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129971085 is a deficient number, since it is larger than the sum of its proper divisors (77982675).

129971085 is an equidigital number, since it uses as much as digits as its factorization.

129971085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8664747.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 129971085 is about 11400.4861738436. The cubic root of 129971085 is about 506.5421407865.

The spelling of 129971085 in words is "one hundred twenty-nine million, nine hundred seventy-one thousand, eighty-five".