129668527 has 4 divisors (see below), whose sum is σ = 132831216. Its totient is φ = 126505840.

The previous prime is 129668519. The next prime is 129668557. The reversal of 129668527 is 725866921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129668527 - 2³ = 129668519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129668557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1581283 + ... + 1581364.

It is an arithmetic number, because the mean of its divisors is an integer number (33207804).

Almost surely, 2^129668527 is an apocalyptic number.

129668527 is a deficient number, since it is larger than the sum of its proper divisors (3162689).

129668527 is an equidigital number, since it uses as much as digits as its factorization.

129668527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3162688.

The product of its digits is 362880, while the sum is 46.

The square root of 129668527 is about 11387.2089205389. The cubic root of 129668527 is about 506.1487777709.

The spelling of 129668527 in words is "one hundred twenty-nine million, six hundred sixty-eight thousand, five hundred twenty-seven".