128530856731 has 2 divisors, whose sum is σ = 128530856732. Its totient is φ = 128530856730.

The previous prime is 128530856719. The next prime is 128530856771. The reversal of 128530856731 is 137658035821.

It is a weak prime.

It is an emirp because it is prime and its reverse (137658035821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128530856731 - 2¹⁹ = 128530332443 is a prime.

It is a super-2 number, since 2×128530856731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128530856771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64265428365 + 64265428366.

It is an arithmetic number, because the mean of its divisors is an integer number (64265428366).

Almost surely, 2^128530856731 is an apocalyptic number.

128530856731 is a deficient number, since it is larger than the sum of its proper divisors (1).

128530856731 is an equidigital number, since it uses as much as digits as its factorization.

128530856731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 128530856731 in words is "one hundred twenty-eight billion, five hundred thirty million, eight hundred fifty-six thousand, seven hundred thirty-one".