129444961 has 2 divisors, whose sum is σ = 129444962. Its totient is φ = 129444960.

The previous prime is 129444949. The next prime is 129444971. The reversal of 129444961 is 169444921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122788561 + 6656400 = 11081^2 + 2580^2 .

It is an emirp because it is prime and its reverse (169444921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129444961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129444911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64722480 + 64722481.

It is an arithmetic number, because the mean of its divisors is an integer number (64722481).

Almost surely, 2^129444961 is an apocalyptic number.

It is an amenable number.

129444961 is a deficient number, since it is larger than the sum of its proper divisors (1).

129444961 is an equidigital number, since it uses as much as digits as its factorization.

129444961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 129444961 is about 11377.3881449127. The cubic root of 129444961 is about 505.8577208849.

Subtracting from 129444961 its sum of digits (40), we obtain a palindrome (129444921).

The spelling of 129444961 in words is "one hundred twenty-nine million, four hundred forty-four thousand, nine hundred sixty-one".