129528407 has 2 divisors, whose sum is σ = 129528408. Its totient is φ = 129528406.

The previous prime is 129528391. The next prime is 129528461. The reversal of 129528407 is 704825921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129528407 - 2⁴ = 129528391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129528467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64764203 + 64764204.

It is an arithmetic number, because the mean of its divisors is an integer number (64764204).

Almost surely, 2^129528407 is an apocalyptic number.

129528407 is a deficient number, since it is larger than the sum of its proper divisors (1).

129528407 is an equidigital number, since it uses as much as digits as its factorization.

129528407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 129528407 is about 11381.0547402251. The cubic root of 129528407 is about 505.9663970249.

The spelling of 129528407 in words is "one hundred twenty-nine million, five hundred twenty-eight thousand, four hundred seven".