129393742409 has 2 divisors, whose sum is σ = 129393742410. Its totient is φ = 129393742408.

The previous prime is 129393742381. The next prime is 129393742433. The reversal of 129393742409 is 904247393921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122472001600 + 6921740809 = 349960^2 + 83197^2 .

It is a cyclic number.

It is not a de Polignac number, because 129393742409 - 2¹⁶ = 129393676873 is a prime.

It is not a weakly prime, because it can be changed into another prime (129393742469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64696871204 + 64696871205.

It is an arithmetic number, because the mean of its divisors is an integer number (64696871205).

Almost surely, 2^129393742409 is an apocalyptic number.

It is an amenable number.

129393742409 is a deficient number, since it is larger than the sum of its proper divisors (1).

129393742409 is an equidigital number, since it uses as much as digits as its factorization.

129393742409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 53.

The spelling of 129393742409 in words is "one hundred twenty-nine billion, three hundred ninety-three million, seven hundred forty-two thousand, four hundred nine".