139117709 has 2 divisors, whose sum is σ = 139117710. Its totient is φ = 139117708.

The previous prime is 139117679. The next prime is 139117721. The reversal of 139117709 is 907711931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82537225 + 56580484 = 9085^2 + 7522^2 .

It is a cyclic number.

It is not a de Polignac number, because 139117709 - 2¹² = 139113613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139117789) 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, 69558854 + 69558855.

It is an arithmetic number, because the mean of its divisors is an integer number (69558855).

Almost surely, 2^139117709 is an apocalyptic number.

It is an amenable number.

139117709 is a deficient number, since it is larger than the sum of its proper divisors (1).

139117709 is an equidigital number, since it uses as much as digits as its factorization.

139117709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11907, while the sum is 38.

The square root of 139117709 is about 11794.8170397001. The cubic root of 139117709 is about 518.1563272005.

The spelling of 139117709 in words is "one hundred thirty-nine million, one hundred seventeen thousand, seven hundred nine".