129081015 has 24 divisors (see below), whose sum is σ = 255703968. Its totient is φ = 59008320.

The previous prime is 129081013. The next prime is 129081067. The reversal of 129081015 is 510180921.

It is not a de Polignac number, because 129081015 - 2¹ = 129081013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129081015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129081011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204576 + ... + 205205.

It is an arithmetic number, because the mean of its divisors is an integer number (10654332).

Almost surely, 2^129081015 is an apocalyptic number.

129081015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129081015 is a deficient number, since it is larger than the sum of its proper divisors (126622953).

129081015 is a wasteful number, since it uses less digits than its factorization.

129081015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409799 (or 409796 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 129081015 is about 11361.3826183260. The cubic root of 129081015 is about 505.3831879120.

The spelling of 129081015 in words is "one hundred twenty-nine million, eighty-one thousand, fifteen".