129181201 has 4 divisors (see below), whose sum is σ = 132332004. Its totient is φ = 126030400.

The previous prime is 129181189. The next prime is 129181229. The reversal of 129181201 is 102181921.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18931201 + 110250000 = 4351^2 + 10500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129181201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129181231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1575340 + ... + 1575421.

It is an arithmetic number, because the mean of its divisors is an integer number (33083001).

Almost surely, 2^129181201 is an apocalyptic number.

It is an amenable number.

129181201 is a deficient number, since it is larger than the sum of its proper divisors (3150803).

129181201 is an equidigital number, since it uses as much as digits as its factorization.

129181201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3150802.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 129181201 is about 11365.7908215839. The cubic root of 129181201 is about 505.5139048531.

The spelling of 129181201 in words is "one hundred twenty-nine million, one hundred eighty-one thousand, two hundred one".