129276901 has 4 divisors (see below), whose sum is σ = 139221292. Its totient is φ = 119332512.

The previous prime is 129276887. The next prime is 129276937. The reversal of 129276901 is 109672921.

It is a Cunningham number, because it is equal to 11370²+1.

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 19131876 + 110145025 = 4374^2 + 10495^2 .

It is not a de Polignac number, because 129276901 - 2¹¹ = 129274853 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129276991) 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, 4972176 + ... + 4972201.

It is an arithmetic number, because the mean of its divisors is an integer number (34805323).

Almost surely, 2^129276901 is an apocalyptic number.

It is an amenable number.

129276901 is a deficient number, since it is larger than the sum of its proper divisors (9944391).

129276901 is an equidigital number, since it uses as much as digits as its factorization.

129276901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9944390.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 129276901 is about 11370.0000439754. Note that the first 4 decimals coincide. The cubic root of 129276901 is about 505.6387056210.

The spelling of 129276901 in words is "one hundred twenty-nine million, two hundred seventy-six thousand, nine hundred one".