129393742391 has 4 divisors (see below), whose sum is σ = 129465192984. Its totient is φ = 129322291800.

The previous prime is 129393742381. The next prime is 129393742409. The reversal of 129393742391 is 193247393921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193247393921 = 127 ⋅1521633023.

It is a cyclic number.

It is not a de Polignac number, because 129393742391 - 2²² = 129389548087 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 (129393742381) 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, 35722580 + ... + 35726201.

It is an arithmetic number, because the mean of its divisors is an integer number (32366298246).

Almost surely, 2^129393742391 is an apocalyptic number.

129393742391 is a deficient number, since it is larger than the sum of its proper divisors (71450593).

129393742391 is an equidigital number, since it uses as much as digits as its factorization.

129393742391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71450592.

The product of its digits is 2204496, while the sum is 53.

The spelling of 129393742391 in words is "one hundred twenty-nine billion, three hundred ninety-three million, seven hundred forty-two thousand, three hundred ninety-one".