129001742 has 4 divisors (see below), whose sum is σ = 193502616. Its totient is φ = 64500870.

The previous prime is 129001739. The next prime is 129001751. The reversal of 129001742 is 247100921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247100921 = 1747 ⋅141443.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32250434 + ... + 32250437.

It is an arithmetic number, because the mean of its divisors is an integer number (48375654).

Almost surely, 2^129001742 is an apocalyptic number.

129001742 is a deficient number, since it is larger than the sum of its proper divisors (64500874).

129001742 is an equidigital number, since it uses as much as digits as its factorization.

129001742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64500873.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 129001742 is about 11357.8933786156. The cubic root of 129001742 is about 505.2797091119.

The spelling of 129001742 in words is "one hundred twenty-nine million, one thousand, seven hundred forty-two".