140128189 has 2 divisors, whose sum is σ = 140128190. Its totient is φ = 140128188.

The previous prime is 140128187. The next prime is 140128193. The reversal of 140128189 is 981821041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137663289 + 2464900 = 11733^2 + 1570^2 .

It is an emirp because it is prime and its reverse (981821041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140128189 - 2¹ = 140128187 is a prime.

Together with 140128187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140128187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70064094 + 70064095.

It is an arithmetic number, because the mean of its divisors is an integer number (70064095).

Almost surely, 2^140128189 is an apocalyptic number.

It is an amenable number.

140128189 is a deficient number, since it is larger than the sum of its proper divisors (1).

140128189 is an equidigital number, since it uses as much as digits as its factorization.

140128189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 140128189 is about 11837.5753007109. The cubic root of 140128189 is about 519.4078429409.

It can be divided in two parts, 14012 and 8189, that added together give a square (22201 = 149²).

The spelling of 140128189 in words is "one hundred forty million, one hundred twenty-eight thousand, one hundred eighty-nine".