129140069 has 2 divisors, whose sum is σ = 129140070. Its totient is φ = 129140068.

The previous prime is 129140059. The next prime is 129140083. The reversal of 129140069 is 960041921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124055044 + 5085025 = 11138^2 + 2255^2 .

It is an emirp because it is prime and its reverse (960041921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129140069 is a prime.

It is a super-2 number, since 2×129140069² = 33354314842649522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129140059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64570034 + 64570035.

It is an arithmetic number, because the mean of its divisors is an integer number (64570035).

Almost surely, 2^129140069 is an apocalyptic number.

It is an amenable number.

129140069 is a deficient number, since it is larger than the sum of its proper divisors (1).

129140069 is an equidigital number, since it uses as much as digits as its factorization.

129140069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 129140069 is about 11363.9812125857. The cubic root of 129140069 is about 505.4602463615.

The spelling of 129140069 in words is "one hundred twenty-nine million, one hundred forty thousand, sixty-nine".