129299641 has 9 divisors (see below), whose sum is σ = 131838511. Its totient is φ = 126809392.

The previous prime is 129299623. The next prime is 129299647. The reversal of 129299641 is 146992921.

The square root of 129299641 is 11371.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 75951225 + 53348416 = 8715^2 + 7304^2 .

It is not a de Polignac number, because 129299641 - 2¹¹ = 129297593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129299647) 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 in 8 ways as a sum of consecutive naturals, for example, 943725 + ... + 943861.

Almost surely, 2^129299641 is an apocalyptic number.

129299641 is the 11371-st square number.

129299641 is the 5686-th centered octagonal number.

It is an amenable number.

129299641 is a deficient number, since it is larger than the sum of its proper divisors (2538870).

129299641 is an frugal number, since it uses more digits than its factorization.

129299641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440 (or 220 counting only the distinct ones).

The product of its digits is 69984, while the sum is 43.

The cubic root of 129299641 is about 505.6683514173.

The spelling of 129299641 in words is "one hundred twenty-nine million, two hundred ninety-nine thousand, six hundred forty-one".