139597 has 2 divisors, whose sum is σ = 139598. Its totient is φ = 139596.

The previous prime is 139591. The next prime is 139609. The reversal of 139597 is 795931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119716 + 19881 = 346^2 + 141^2 .

It is an emirp because it is prime and its reverse (795931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139597 - 2³ = 139589 is a prime.

139597 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69798 + 69799.

It is an arithmetic number, because the mean of its divisors is an integer number (69799).

2¹³⁹⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

139597 is a deficient number, since it is larger than the sum of its proper divisors (1).

139597 is an equidigital number, since it uses as much as digits as its factorization.

139597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8505, while the sum is 34.

The square root of 139597 is about 373.6268191659. The cubic root of 139597 is about 51.8750699181.

The spelling of 139597 in words is "one hundred thirty-nine thousand, five hundred ninety-seven".