129173740427 has 2 divisors, whose sum is σ = 129173740428. Its totient is φ = 129173740426.

The previous prime is 129173740403. The next prime is 129173740439. The reversal of 129173740427 is 724047371921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129173740427 - 2¹⁶ = 129173674891 is a prime.

It is not a weakly prime, because it can be changed into another prime (129173740027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64586870213 + 64586870214.

It is an arithmetic number, because the mean of its divisors is an integer number (64586870214).

Almost surely, 2^129173740427 is an apocalyptic number.

129173740427 is a deficient number, since it is larger than the sum of its proper divisors (1).

129173740427 is an equidigital number, since it uses as much as digits as its factorization.

129173740427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 47.

The spelling of 129173740427 in words is "one hundred twenty-nine billion, one hundred seventy-three million, seven hundred forty thousand, four hundred twenty-seven".