129665147 has 2 divisors, whose sum is σ = 129665148. Its totient is φ = 129665146.

The previous prime is 129665141. The next prime is 129665161. The reversal of 129665147 is 741566921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129665147 - 2¹⁶ = 129599611 is a prime.

It is not a weakly prime, because it can be changed into another prime (129665141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64832573 + 64832574.

It is an arithmetic number, because the mean of its divisors is an integer number (64832574).

Almost surely, 2^129665147 is an apocalyptic number.

129665147 is a deficient number, since it is larger than the sum of its proper divisors (1).

129665147 is an equidigital number, since it uses as much as digits as its factorization.

129665147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 129665147 is about 11387.0605074356. The cubic root of 129665147 is about 506.1443798964.

The spelling of 129665147 in words is "one hundred twenty-nine million, six hundred sixty-five thousand, one hundred forty-seven".