129251041 has 4 divisors (see below), whose sum is σ = 129275332. Its totient is φ = 129226752.

The previous prime is 129251039. The next prime is 129251063. The reversal of 129251041 is 140152921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15210000 + 114041041 = 3900^2 + 10679^2 .

It is a cyclic number.

It is not a de Polignac number, because 129251041 - 2¹ = 129251039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129250997 and 129251015.

It is not an unprimeable number, because it can be changed into a prime (129251021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336 + ... + 16081.

It is an arithmetic number, because the mean of its divisors is an integer number (32318833).

Almost surely, 2^129251041 is an apocalyptic number.

It is an amenable number.

129251041 is a deficient number, since it is larger than the sum of its proper divisors (24291).

129251041 is an equidigital number, since it uses as much as digits as its factorization.

129251041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24290.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 129251041 is about 11368.8627839375. The cubic root of 129251041 is about 505.6049881025.

The spelling of 129251041 in words is "one hundred twenty-nine million, two hundred fifty-one thousand, forty-one".