129651829 has 2 divisors, whose sum is σ = 129651830. Its totient is φ = 129651828.

The previous prime is 129651817. The next prime is 129651853. The reversal of 129651829 is 928156921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73925604 + 55726225 = 8598^2 + 7465^2 .

It is an emirp because it is prime and its reverse (928156921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129651829 - 2⁹ = 129651317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129651859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64825914 + 64825915.

It is an arithmetic number, because the mean of its divisors is an integer number (64825915).

Almost surely, 2^129651829 is an apocalyptic number.

It is an amenable number.

129651829 is a deficient number, since it is larger than the sum of its proper divisors (1).

129651829 is an equidigital number, since it uses as much as digits as its factorization.

129651829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 43.

The square root of 129651829 is about 11386.4757058539. The cubic root of 129651829 is about 506.1270504859.

The spelling of 129651829 in words is "one hundred twenty-nine million, six hundred fifty-one thousand, eight hundred twenty-nine".