139783121509 has 2 divisors, whose sum is σ = 139783121510. Its totient is φ = 139783121508.

The previous prime is 139783121477. The next prime is 139783121561. The reversal of 139783121509 is 905121387931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114534864900 + 25248256609 = 338430^2 + 158897^2 .

It is a cyclic number.

It is not a de Polignac number, because 139783121509 - 2⁵ = 139783121477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139783121209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69891560754 + 69891560755.

It is an arithmetic number, because the mean of its divisors is an integer number (69891560755).

Almost surely, 2^139783121509 is an apocalyptic number.

It is an amenable number.

139783121509 is a deficient number, since it is larger than the sum of its proper divisors (1).

139783121509 is an equidigital number, since it uses as much as digits as its factorization.

139783121509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 49.

The spelling of 139783121509 in words is "one hundred thirty-nine billion, seven hundred eighty-three million, one hundred twenty-one thousand, five hundred nine".