129251042 has 6 divisors (see below), whose sum is σ = 193900683. Its totient is φ = 64617482.

The previous prime is 129251039. The next prime is 129251063. The reversal of 129251042 is 240152921.

It can be written as a sum of positive squares in only one way, i.e., 64625521 + 64625521 = 8039^2 + 8039^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8039.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12059 + ... + 20097.

Almost surely, 2^129251042 is an apocalyptic number.

129251042 is a deficient number, since it is larger than the sum of its proper divisors (64649641).

129251042 is an frugal number, since it uses more digits than its factorization.

129251042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16080 (or 8041 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 129251042 is about 11368.8628279173. The cubic root of 129251042 is about 505.6049894064.

The spelling of 129251042 in words is "one hundred twenty-nine million, two hundred fifty-one thousand, forty-two".