139439513 has 2 divisors, whose sum is σ = 139439514. Its totient is φ = 139439512.

The previous prime is 139439507. The next prime is 139439539. The reversal of 139439513 is 315934931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100962304 + 38477209 = 10048^2 + 6203^2 .

It is a cyclic number.

It is not a de Polignac number, because 139439513 - 2⁸ = 139439257 is a prime.

It is not a weakly prime, because it can be changed into another prime (139430513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69719756 + 69719757.

It is an arithmetic number, because the mean of its divisors is an integer number (69719757).

Almost surely, 2^139439513 is an apocalyptic number.

It is an amenable number.

139439513 is a deficient number, since it is larger than the sum of its proper divisors (1).

139439513 is an equidigital number, since it uses as much as digits as its factorization.

139439513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 38.

The square root of 139439513 is about 11808.4509144934. The cubic root of 139439513 is about 518.5555487776. Note that the first 4 decimals are identical.

The spelling of 139439513 in words is "one hundred thirty-nine million, four hundred thirty-nine thousand, five hundred thirteen".