129771533 has 2 divisors, whose sum is σ = 129771534. Its totient is φ = 129771532.

The previous prime is 129771517. The next prime is 129771569. The reversal of 129771533 is 335177921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127735204 + 2036329 = 11302^2 + 1427^2 .

It is a cyclic number.

It is not a de Polignac number, because 129771533 - 2⁴ = 129771517 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 (129771233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64885766 + 64885767.

It is an arithmetic number, because the mean of its divisors is an integer number (64885767).

Almost surely, 2^129771533 is an apocalyptic number.

It is an amenable number.

129771533 is a deficient number, since it is larger than the sum of its proper divisors (1).

129771533 is an equidigital number, since it uses as much as digits as its factorization.

129771533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 38.

The square root of 129771533 is about 11391.7309044763. The cubic root of 129771533 is about 506.2827670098.

The spelling of 129771533 in words is "one hundred twenty-nine million, seven hundred seventy-one thousand, five hundred thirty-three".