129137447 has 2 divisors, whose sum is σ = 129137448. Its totient is φ = 129137446.

The previous prime is 129137441. The next prime is 129137453. The reversal of 129137447 is 744731921.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (129137441) and next prime (129137453).

It is a cyclic number.

It is not a de Polignac number, because 129137447 - 2¹⁶ = 129071911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129137447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129137441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64568723 + 64568724.

It is an arithmetic number, because the mean of its divisors is an integer number (64568724).

Almost surely, 2^129137447 is an apocalyptic number.

129137447 is a deficient number, since it is larger than the sum of its proper divisors (1).

129137447 is an equidigital number, since it uses as much as digits as its factorization.

129137447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The square root of 129137447 is about 11363.8658475010. The cubic root of 129137447 is about 505.4568254616.

The spelling of 129137447 in words is "one hundred twenty-nine million, one hundred thirty-seven thousand, four hundred forty-seven".