129539771 has 2 divisors, whose sum is σ = 129539772. Its totient is φ = 129539770.

The previous prime is 129539759. The next prime is 129539789. The reversal of 129539771 is 177935921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129539771 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (129539171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64769885 + 64769886.

It is an arithmetic number, because the mean of its divisors is an integer number (64769886).

Almost surely, 2^129539771 is an apocalyptic number.

129539771 is a deficient number, since it is larger than the sum of its proper divisors (1).

129539771 is an equidigital number, since it uses as much as digits as its factorization.

129539771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119070, while the sum is 44.

The square root of 129539771 is about 11381.5539800152. The cubic root of 129539771 is about 505.9811933519.

The spelling of 129539771 in words is "one hundred twenty-nine million, five hundred thirty-nine thousand, seven hundred seventy-one".