128781713 has 2 divisors, whose sum is σ = 128781714. Its totient is φ = 128781712.

The previous prime is 128781703. The next prime is 128781769. The reversal of 128781713 is 317187821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126855169 + 1926544 = 11263^2 + 1388^2 .

It is a cyclic number.

It is not a de Polignac number, because 128781713 - 2¹² = 128777617 is a prime.

It is not a weakly prime, because it can be changed into another prime (128781703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64390856 + 64390857.

It is an arithmetic number, because the mean of its divisors is an integer number (64390857).

Almost surely, 2^128781713 is an apocalyptic number.

It is an amenable number.

128781713 is a deficient number, since it is larger than the sum of its proper divisors (1).

128781713 is an equidigital number, since it uses as much as digits as its factorization.

128781713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 38.

The square root of 128781713 is about 11348.2030736148. The cubic root of 128781713 is about 504.9922725348.

The spelling of 128781713 in words is "one hundred twenty-eight million, seven hundred eighty-one thousand, seven hundred thirteen".