129039040391 has 2 divisors, whose sum is σ = 129039040392. Its totient is φ = 129039040390.

The previous prime is 129039040387. The next prime is 129039040393. The reversal of 129039040391 is 193040930921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129039040391 - 2² = 129039040387 is a prime.

Together with 129039040393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129039040393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64519520195 + 64519520196.

It is an arithmetic number, because the mean of its divisors is an integer number (64519520196).

Almost surely, 2^129039040391 is an apocalyptic number.

129039040391 is a deficient number, since it is larger than the sum of its proper divisors (1).

129039040391 is an equidigital number, since it uses as much as digits as its factorization.

129039040391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The spelling of 129039040391 in words is "one hundred twenty-nine billion, thirty-nine million, forty thousand, three hundred ninety-one".