139065989 has 2 divisors, whose sum is σ = 139065990. Its totient is φ = 139065988.

The previous prime is 139065977. The next prime is 139066007. The reversal of 139065989 is 989560931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124701889 + 14364100 = 11167^2 + 3790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139065989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139067989) 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, 69532994 + 69532995.

It is an arithmetic number, because the mean of its divisors is an integer number (69532995).

Almost surely, 2^139065989 is an apocalyptic number.

It is an amenable number.

139065989 is a deficient number, since it is larger than the sum of its proper divisors (1).

139065989 is an equidigital number, since it uses as much as digits as its factorization.

139065989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 50.

The square root of 139065989 is about 11792.6243474470. The cubic root of 139065989 is about 518.0921073223.

The spelling of 139065989 in words is "one hundred thirty-nine million, sixty-five thousand, nine hundred eighty-nine".