139081289 has 2 divisors, whose sum is σ = 139081290. Its totient is φ = 139081288.

The previous prime is 139081277. The next prime is 139081331. The reversal of 139081289 is 982180931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96727225 + 42354064 = 9835^2 + 6508^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139081289 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (139081249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69540644 + 69540645.

It is an arithmetic number, because the mean of its divisors is an integer number (69540645).

Almost surely, 2^139081289 is an apocalyptic number.

It is an amenable number.

139081289 is a deficient number, since it is larger than the sum of its proper divisors (1).

139081289 is an equidigital number, since it uses as much as digits as its factorization.

139081289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 139081289 is about 11793.2730401700. The cubic root of 139081289 is about 518.1111067403. Note that the first 4 decimals are identical.

The spelling of 139081289 in words is "one hundred thirty-nine million, eighty-one thousand, two hundred eighty-nine".