128382277 has 2 divisors, whose sum is σ = 128382278. Its totient is φ = 128382276.

The previous prime is 128382203. The next prime is 128382281. The reversal of 128382277 is 772283821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127938721 + 443556 = 11311^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 128382277 - 2¹⁵ = 128349509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128382077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64191138 + 64191139.

It is an arithmetic number, because the mean of its divisors is an integer number (64191139).

Almost surely, 2^128382277 is an apocalyptic number.

It is an amenable number.

128382277 is a deficient number, since it is larger than the sum of its proper divisors (1).

128382277 is an equidigital number, since it uses as much as digits as its factorization.

128382277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 40.

The square root of 128382277 is about 11330.5903200142. The cubic root of 128382277 is about 504.4696284532.

The spelling of 128382277 in words is "one hundred twenty-eight million, three hundred eighty-two thousand, two hundred seventy-seven".