129540757 has 2 divisors, whose sum is σ = 129540758. Its totient is φ = 129540756.

The previous prime is 129540751. The next prime is 129540769. The reversal of 129540757 is 757045921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128845201 + 695556 = 11351^2 + 834^2 .

It is a cyclic number.

It is not a de Polignac number, because 129540757 - 2¹¹ = 129538709 is a prime.

It is equal to p_7353679 and since 129540757 and 7353679 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129540751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64770378 + 64770379.

It is an arithmetic number, because the mean of its divisors is an integer number (64770379).

Almost surely, 2^129540757 is an apocalyptic number.

It is an amenable number.

129540757 is a deficient number, since it is larger than the sum of its proper divisors (1).

129540757 is an equidigital number, since it uses as much as digits as its factorization.

129540757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88200, while the sum is 40.

The square root of 129540757 is about 11381.5972956347. The cubic root of 129540757 is about 505.9824771177.

The spelling of 129540757 in words is "one hundred twenty-nine million, five hundred forty thousand, seven hundred fifty-seven".