128734500049 has 2 divisors, whose sum is σ = 128734500050. Its totient is φ = 128734500048.

The previous prime is 128734500023. The next prime is 128734500077. The reversal of 128734500049 is 940005437821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67804514449 + 60929985600 = 260393^2 + 246840^2 .

It is a cyclic number.

It is not a de Polignac number, because 128734500049 - 2¹⁹ = 128733975761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128734499978 and 128734500014.

It is not a weakly prime, because it can be changed into another prime (128734500449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64367250024 + 64367250025.

It is an arithmetic number, because the mean of its divisors is an integer number (64367250025).

Almost surely, 2^128734500049 is an apocalyptic number.

It is an amenable number.

128734500049 is a deficient number, since it is larger than the sum of its proper divisors (1).

128734500049 is an equidigital number, since it uses as much as digits as its factorization.

128734500049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 128734500049 in words is "one hundred twenty-eight billion, seven hundred thirty-four million, five hundred thousand, forty-nine".