128361139 has 2 divisors, whose sum is σ = 128361140. Its totient is φ = 128361138.

The previous prime is 128361109. The next prime is 128361157. The reversal of 128361139 is 931163821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128361139 - 2⁷ = 128361011 is a prime.

It is not a weakly prime, because it can be changed into another prime (128361109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64180569 + 64180570.

It is an arithmetic number, because the mean of its divisors is an integer number (64180570).

Almost surely, 2^128361139 is an apocalyptic number.

128361139 is a deficient number, since it is larger than the sum of its proper divisors (1).

128361139 is an equidigital number, since it uses as much as digits as its factorization.

128361139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 128361139 is about 11329.6574970296. The cubic root of 128361139 is about 504.4419401446.

The spelling of 128361139 in words is "one hundred twenty-eight million, three hundred sixty-one thousand, one hundred thirty-nine".