129728701 has 2 divisors, whose sum is σ = 129728702. Its totient is φ = 129728700.

The previous prime is 129728699. The next prime is 129728719. The reversal of 129728701 is 107827921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126023076 + 3705625 = 11226^2 + 1925^2 .

It is an emirp because it is prime and its reverse (107827921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129728701 - 2¹ = 129728699 is a prime.

Together with 129728699, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129728741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64864350 + 64864351.

It is an arithmetic number, because the mean of its divisors is an integer number (64864351).

Almost surely, 2^129728701 is an apocalyptic number.

It is an amenable number.

129728701 is a deficient number, since it is larger than the sum of its proper divisors (1).

129728701 is an equidigital number, since it uses as much as digits as its factorization.

129728701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 129728701 is about 11389.8507891895. The cubic root of 129728701 is about 506.2270601606.

The spelling of 129728701 in words is "one hundred twenty-nine million, seven hundred twenty-eight thousand, seven hundred one".