129389501 has 2 divisors, whose sum is σ = 129389502. Its totient is φ = 129389500.

The previous prime is 129389489. The next prime is 129389531. The reversal of 129389501 is 105983921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124322500 + 5067001 = 11150^2 + 2251^2 .

It is an emirp because it is prime and its reverse (105983921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129389501 - 2²² = 125195197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129389531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64694750 + 64694751.

It is an arithmetic number, because the mean of its divisors is an integer number (64694751).

Almost surely, 2^129389501 is an apocalyptic number.

It is an amenable number.

129389501 is a deficient number, since it is larger than the sum of its proper divisors (1).

129389501 is an equidigital number, since it uses as much as digits as its factorization.

129389501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 129389501 is about 11374.9505932993. The cubic root of 129389501 is about 505.7854665549.

The spelling of 129389501 in words is "one hundred twenty-nine million, three hundred eighty-nine thousand, five hundred one".