129207073 has 2 divisors, whose sum is σ = 129207074. Its totient is φ = 129207072.

The previous prime is 129207053. The next prime is 129207083. The reversal of 129207073 is 370702921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127509264 + 1697809 = 11292^2 + 1303^2 .

It is a cyclic number.

It is not a de Polignac number, because 129207073 - 2⁵ = 129207041 is a prime.

It is not a weakly prime, because it can be changed into another prime (129207053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64603536 + 64603537.

It is an arithmetic number, because the mean of its divisors is an integer number (64603537).

Almost surely, 2^129207073 is an apocalyptic number.

It is an amenable number.

129207073 is a deficient number, since it is larger than the sum of its proper divisors (1).

129207073 is an equidigital number, since it uses as much as digits as its factorization.

129207073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 129207073 is about 11366.9289168183. The cubic root of 129207073 is about 505.5476501727.

Adding to 129207073 its reverse (370702921), we get a palindrome (499909994).

The spelling of 129207073 in words is "one hundred twenty-nine million, two hundred seven thousand, seventy-three".