129427001 has 16 divisors (see below), whose sum is σ = 150206400. Its totient is φ = 110215680.

The previous prime is 129426991. The next prime is 129427021. The reversal of 129427001 is 100724921.

It is a cyclic number.

It is not a de Polignac number, because 129427001 - 2¹⁸ = 129164857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129427021) 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 15 ways as a sum of consecutive naturals, for example, 40925 + ... + 43973.

It is an arithmetic number, because the mean of its divisors is an integer number (9387900).

Almost surely, 2^129427001 is an apocalyptic number.

129427001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129427001 is a deficient number, since it is larger than the sum of its proper divisors (20779399).

129427001 is a wasteful number, since it uses less digits than its factorization.

129427001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 129427001 is about 11376.5988326916. The cubic root of 129427001 is about 505.8343245194.

The spelling of 129427001 in words is "one hundred twenty-nine million, four hundred twenty-seven thousand, one".