129491942757 has 4 divisors (see below), whose sum is σ = 172655923680. Its totient is φ = 86327961836.

The previous prime is 129491942729. The next prime is 129491942773. The reversal of 129491942757 is 757249194921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 757249194921 = 3 ⋅252416398307.

It is a cyclic number.

It is not a de Polignac number, because 129491942757 - 2¹¹ = 129491940709 is a prime.

It is a super-2 number, since 2×129491942757² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129491942757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129491942777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21581990457 + ... + 21581990462.

It is an arithmetic number, because the mean of its divisors is an integer number (43163980920).

Almost surely, 2^129491942757 is an apocalyptic number.

It is an amenable number.

129491942757 is a deficient number, since it is larger than the sum of its proper divisors (43163980923).

129491942757 is an equidigital number, since it uses as much as digits as its factorization.

129491942757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43163980922.

The product of its digits is 11430720, while the sum is 60.

The spelling of 129491942757 in words is "one hundred twenty-nine billion, four hundred ninety-one million, nine hundred forty-two thousand, seven hundred fifty-seven".