128787493 has 2 divisors, whose sum is σ = 128787494. Its totient is φ = 128787492.

The previous prime is 128787479. The next prime is 128787497. The reversal of 128787493 is 394787821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82029249 + 46758244 = 9057^2 + 6838^2 .

It is a cyclic number.

It is not a de Polignac number, because 128787493 - 2¹⁷ = 128656421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128787497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64393746 + 64393747.

It is an arithmetic number, because the mean of its divisors is an integer number (64393747).

Almost surely, 2^128787493 is an apocalyptic number.

It is an amenable number.

128787493 is a deficient number, since it is larger than the sum of its proper divisors (1).

128787493 is an equidigital number, since it uses as much as digits as its factorization.

128787493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 49.

The square root of 128787493 is about 11348.4577366266. The cubic root of 128787493 is about 504.9998274678. Note that the first 3 decimals are identical.

The spelling of 128787493 in words is "one hundred twenty-eight million, seven hundred eighty-seven thousand, four hundred ninety-three".