129448112639 has 4 divisors (see below), whose sum is σ = 133623858240. Its totient is φ = 125272367040.

The previous prime is 129448112623. The next prime is 129448112657. The reversal of 129448112639 is 936211844921.

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

It is a cyclic number.

It is not a de Polignac number, because 129448112639 - 2⁴ = 129448112623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129448112539) 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, 2087872754 + ... + 2087872815.

It is an arithmetic number, because the mean of its divisors is an integer number (33405964560).

Almost surely, 2^129448112639 is an apocalyptic number.

129448112639 is a deficient number, since it is larger than the sum of its proper divisors (4175745601).

129448112639 is an equidigital number, since it uses as much as digits as its factorization.

129448112639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175745600.

The product of its digits is 746496, while the sum is 50.

The spelling of 129448112639 in words is "one hundred twenty-nine billion, four hundred forty-eight million, one hundred twelve thousand, six hundred thirty-nine".