129505746631 has 2 divisors, whose sum is σ = 129505746632. Its totient is φ = 129505746630.

The previous prime is 129505746593. The next prime is 129505746737. The reversal of 129505746631 is 136647505921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129505746631 is a prime.

It is a super-2 number, since 2×129505746631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129505746031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64752873315 + 64752873316.

It is an arithmetic number, because the mean of its divisors is an integer number (64752873316).

Almost surely, 2^129505746631 is an apocalyptic number.

129505746631 is a deficient number, since it is larger than the sum of its proper divisors (1).

129505746631 is an equidigital number, since it uses as much as digits as its factorization.

129505746631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 129505746631 in words is "one hundred twenty-nine billion, five hundred five million, seven hundred forty-six thousand, six hundred thirty-one".