129773129 has 2 divisors, whose sum is σ = 129773130. Its totient is φ = 129773128.

The previous prime is 129773101. The next prime is 129773141. The reversal of 129773129 is 921377921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128142400 + 1630729 = 11320^2 + 1277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129773129 is a prime.

It is not a weakly prime, because it can be changed into another prime (129779129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64886564 + 64886565.

It is an arithmetic number, because the mean of its divisors is an integer number (64886565).

Almost surely, 2^129773129 is an apocalyptic number.

It is an amenable number.

129773129 is a deficient number, since it is larger than the sum of its proper divisors (1).

129773129 is an equidigital number, since it uses as much as digits as its factorization.

129773129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 41.

The square root of 129773129 is about 11391.8009550729. The cubic root of 129773129 is about 506.2848425138.

The spelling of 129773129 in words is "one hundred twenty-nine million, seven hundred seventy-three thousand, one hundred twenty-nine".