139013 has 6 divisors (see below), whose sum is σ = 161766. Its totient is φ = 119112.

The previous prime is 138977. The next prime is 139021. The reversal of 139013 is 310931.

It can be written as a sum of positive squares in only one way, i.e., 82369 + 56644 = 287^2 + 238^2 .

It is not a de Polignac number, because 139013 - 2¹² = 134917 is a prime.

It is a super-2 number, since 2×139013² = 38649228338, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138982 and 139000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1370 + ... + 1467.

It is an arithmetic number, because the mean of its divisors is an integer number (26961).

2¹³⁹⁰¹³ is an apocalyptic number.

It is an amenable number.

139013 is a deficient number, since it is larger than the sum of its proper divisors (22753).

139013 is an equidigital number, since it uses as much as digits as its factorization.

139013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851 (or 2844 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 17.

The square root of 139013 is about 372.8444715964. The cubic root of 139013 is about 51.8026295232.

Adding to 139013 its reverse (310931), we get a palindrome (449944).

The spelling of 139013 in words is "one hundred thirty-nine thousand, thirteen".