129779981371 has 4 divisors (see below), whose sum is σ = 130044299544. Its totient is φ = 129515663200.

The previous prime is 129779981351. The next prime is 129779981389. The reversal of 129779981371 is 173189977921.

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 129779981371 - 2¹³ = 129779973179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129779981351) 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, 132158350 + ... + 132159331.

It is an arithmetic number, because the mean of its divisors is an integer number (32511074886).

Almost surely, 2^129779981371 is an apocalyptic number.

129779981371 is a deficient number, since it is larger than the sum of its proper divisors (264318173).

129779981371 is an equidigital number, since it uses as much as digits as its factorization.

129779981371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264318172.

The product of its digits is 12002256, while the sum is 64.

The spelling of 129779981371 in words is "one hundred twenty-nine billion, seven hundred seventy-nine million, nine hundred eighty-one thousand, three hundred seventy-one".