139720013 has 2 divisors, whose sum is σ = 139720014. Its totient is φ = 139720012.

The previous prime is 139720003. The next prime is 139720019. The reversal of 139720013 is 310027931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111978724 + 27741289 = 10582^2 + 5267^2 .

It is a cyclic number.

It is not a de Polignac number, because 139720013 - 2⁴ = 139719997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139720019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69860006 + 69860007.

It is an arithmetic number, because the mean of its divisors is an integer number (69860007).

Almost surely, 2^139720013 is an apocalyptic number.

It is an amenable number.

139720013 is a deficient number, since it is larger than the sum of its proper divisors (1).

139720013 is an equidigital number, since it uses as much as digits as its factorization.

139720013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 139720013 is about 11820.3220345302. The cubic root of 139720013 is about 518.9030289708.

Adding to 139720013 its reverse (310027931), we get a palindrome (449747944).

The spelling of 139720013 in words is "one hundred thirty-nine million, seven hundred twenty thousand, thirteen".