129501285 has 16 divisors (see below), whose sum is σ = 210296256. Its totient is φ = 68035968.

The previous prime is 129501271. The next prime is 129501287. The reversal of 129501285 is 582105921.

It is not a de Polignac number, because 129501285 - 2⁹ = 129500773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129501287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63424 + ... + 65433.

It is an arithmetic number, because the mean of its divisors is an integer number (13143516).

Almost surely, 2^129501285 is an apocalyptic number.

129501285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129501285 is a deficient number, since it is larger than the sum of its proper divisors (80794971).

129501285 is a wasteful number, since it uses less digits than its factorization.

129501285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128932.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 129501285 is about 11379.8631362596. The cubic root of 129501285 is about 505.9310797307.

The spelling of 129501285 in words is "one hundred twenty-nine million, five hundred one thousand, two hundred eighty-five".