139246109 has 2 divisors, whose sum is σ = 139246110. Its totient is φ = 139246108.

The previous prime is 139246097. The next prime is 139246147. The reversal of 139246109 is 901642931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114276100 + 24970009 = 10690^2 + 4997^2 .

It is a cyclic number.

It is not a de Polignac number, because 139246109 - 2⁸ = 139245853 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (139246189) 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, 69623054 + 69623055.

It is an arithmetic number, because the mean of its divisors is an integer number (69623055).

Almost surely, 2^139246109 is an apocalyptic number.

It is an amenable number.

139246109 is a deficient number, since it is larger than the sum of its proper divisors (1).

139246109 is an equidigital number, since it uses as much as digits as its factorization.

139246109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 139246109 is about 11800.2588530930. The cubic root of 139246109 is about 518.3156906029.

The spelling of 139246109 in words is "one hundred thirty-nine million, two hundred forty-six thousand, one hundred nine".