129556007 has 4 divisors (see below), whose sum is σ = 148064016. Its totient is φ = 111048000.

The previous prime is 129556001. The next prime is 129556019. The reversal of 129556007 is 700655921.

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

It is not a de Polignac number, because 129556007 - 2¹⁸ = 129293863 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 (129556001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9253994 + ... + 9254007.

It is an arithmetic number, because the mean of its divisors is an integer number (37016004).

Almost surely, 2^129556007 is an apocalyptic number.

129556007 is a deficient number, since it is larger than the sum of its proper divisors (18508009).

129556007 is an equidigital number, since it uses as much as digits as its factorization.

129556007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18508008.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 129556007 is about 11382.2672170355. The cubic root of 129556007 is about 506.0023316926.

The spelling of 129556007 in words is "one hundred twenty-nine million, five hundred fifty-six thousand, seven".