129127501 has 2 divisors, whose sum is σ = 129127502. Its totient is φ = 129127500.

The previous prime is 129127469. The next prime is 129127507. The reversal of 129127501 is 105721921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119355625 + 9771876 = 10925^2 + 3126^2 .

It is a cyclic number.

It is not a de Polignac number, because 129127501 - 2⁵ = 129127469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129127501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129127507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64563750 + 64563751.

It is an arithmetic number, because the mean of its divisors is an integer number (64563751).

Almost surely, 2^129127501 is an apocalyptic number.

It is an amenable number.

129127501 is a deficient number, since it is larger than the sum of its proper divisors (1).

129127501 is an equidigital number, since it uses as much as digits as its factorization.

129127501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 129127501 is about 11363.4282239120. The cubic root of 129127501 is about 505.4438485837.

The spelling of 129127501 in words is "one hundred twenty-nine million, one hundred twenty-seven thousand, five hundred one".