129135389 has 2 divisors, whose sum is σ = 129135390. Its totient is φ = 129135388.

The previous prime is 129135379. The next prime is 129135403. The reversal of 129135389 is 983531921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128074489 + 1060900 = 11317^2 + 1030^2 .

It is an emirp because it is prime and its reverse (983531921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129135389 - 2¹² = 129131293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129135329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64567694 + 64567695.

It is an arithmetic number, because the mean of its divisors is an integer number (64567695).

Almost surely, 2^129135389 is an apocalyptic number.

It is an amenable number.

129135389 is a deficient number, since it is larger than the sum of its proper divisors (1).

129135389 is an equidigital number, since it uses as much as digits as its factorization.

129135389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 41.

The square root of 129135389 is about 11363.7752969689. The cubic root of 129135389 is about 505.4541403751.

The spelling of 129135389 in words is "one hundred twenty-nine million, one hundred thirty-five thousand, three hundred eighty-nine".