129712505 has 16 divisors (see below), whose sum is σ = 173411280. Its totient is φ = 92483328.

The previous prime is 129712477. The next prime is 129712537. The reversal of 129712505 is 505217921.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1026169 + 128686336 = 1013^2 + 11344^2 .

It is a cyclic number.

It is not a de Polignac number, because 129712505 - 2⁶ = 129712441 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32522 + ... + 36291.

It is an arithmetic number, because the mean of its divisors is an integer number (10838205).

Almost surely, 2^129712505 is an apocalyptic number.

It is an amenable number.

129712505 is a deficient number, since it is larger than the sum of its proper divisors (43698775).

129712505 is a wasteful number, since it uses less digits than its factorization.

129712505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68860.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 129712505 is about 11389.1397831443. The cubic root of 129712505 is about 506.2059926183.

The spelling of 129712505 in words is "one hundred twenty-nine million, seven hundred twelve thousand, five hundred five".