129013605 has 72 divisors (see below), whose sum is σ = 265229952. Its totient is φ = 56827008.

The previous prime is 129013571. The next prime is 129013627. The reversal of 129013605 is 506310921.

It is not a de Polignac number, because 129013605 - 2⁶ = 129013541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 264672 + ... + 265158.

Almost surely, 2^129013605 is an apocalyptic number.

129013605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129013605 is an abundant number, since it is smaller than the sum of its proper divisors (136216347).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129013605 is a wasteful number, since it uses less digits than its factorization.

129013605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 129013605 is about 11358.4156025389. The cubic root of 129013605 is about 505.2951971442.

The spelling of 129013605 in words is "one hundred twenty-nine million, thirteen thousand, six hundred five".