129542377 has 2 divisors, whose sum is σ = 129542378. Its totient is φ = 129542376.

The previous prime is 129542353. The next prime is 129542389. The reversal of 129542377 is 773245921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84437721 + 45104656 = 9189^2 + 6716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129542377 is a prime.

It is not a weakly prime, because it can be changed into another prime (129542977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64771188 + 64771189.

It is an arithmetic number, because the mean of its divisors is an integer number (64771189).

Almost surely, 2^129542377 is an apocalyptic number.

It is an amenable number.

129542377 is a deficient number, since it is larger than the sum of its proper divisors (1).

129542377 is an equidigital number, since it uses as much as digits as its factorization.

129542377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 40.

The square root of 129542377 is about 11381.6684629276. The cubic root of 129542377 is about 505.9845863334.

The spelling of 129542377 in words is "one hundred twenty-nine million, five hundred forty-two thousand, three hundred seventy-seven".