139119509 has 2 divisors, whose sum is σ = 139119510. Its totient is φ = 139119508.

The previous prime is 139119499. The next prime is 139119523. The reversal of 139119509 is 905911931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126000625 + 13118884 = 11225^2 + 3622^2 .

It is a cyclic number.

It is not a de Polignac number, because 139119509 - 2⁴ = 139119493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139119529) 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, 69559754 + 69559755.

It is an arithmetic number, because the mean of its divisors is an integer number (69559755).

Almost surely, 2^139119509 is an apocalyptic number.

It is an amenable number.

139119509 is a deficient number, since it is larger than the sum of its proper divisors (1).

139119509 is an equidigital number, since it uses as much as digits as its factorization.

139119509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10935, while the sum is 38.

The square root of 139119509 is about 11794.8933441553. The cubic root of 139119509 is about 518.1585619444.

The spelling of 139119509 in words is "one hundred thirty-nine million, one hundred nineteen thousand, five hundred nine".