129142505 has 8 divisors (see below), whose sum is σ = 155126400. Its totient is φ = 103210416.

The previous prime is 129142483. The next prime is 129142513. The reversal of 129142505 is 505241921.

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

It is a cyclic number.

It is not a de Polignac number, because 129142505 - 2⁶ = 129142441 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7235 + ... + 17624.

It is an arithmetic number, because the mean of its divisors is an integer number (19390800).

Almost surely, 2^129142505 is an apocalyptic number.

It is an amenable number.

129142505 is a deficient number, since it is larger than the sum of its proper divisors (25983895).

129142505 is a wasteful number, since it uses less digits than its factorization.

129142505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25903.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 129142505 is about 11364.0883928276. The cubic root of 129142505 is about 505.4634245474.

The spelling of 129142505 in words is "one hundred twenty-nine million, one hundred forty-two thousand, five hundred five".