129001265279 has 4 divisors (see below), whose sum is σ = 129119942784. Its totient is φ = 128882587776.

The previous prime is 129001265251. The next prime is 129001265293. The reversal of 129001265279 is 972562100921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 972562100921 = 15101 ⋅64403821.

It is a cyclic number.

It is not a de Polignac number, because 129001265279 - 2⁸ = 129001265023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129001262279) 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, 59337122 + ... + 59339295.

It is an arithmetic number, because the mean of its divisors is an integer number (32279985696).

Almost surely, 2^129001265279 is an apocalyptic number.

129001265279 is a deficient number, since it is larger than the sum of its proper divisors (118677505).

129001265279 is a wasteful number, since it uses less digits than its factorization.

129001265279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118677504.

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 129001265279 in words is "one hundred twenty-nine billion, one million, two hundred sixty-five thousand, two hundred seventy-nine".