138228613 has 4 divisors (see below), whose sum is σ = 138326508. Its totient is φ = 138130720.

The previous prime is 138228593. The next prime is 138228631. The reversal of 138228613 is 316822831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 316822831 = 13 ⋅24370987.

It can be written as a sum of positive squares in 2 ways, for example, as 128097124 + 10131489 = 11318^2 + 3183^2 .

It is a cyclic number.

It is not a de Polignac number, because 138228613 - 2¹⁷ = 138097541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138228653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46798 + ... + 49663.

It is an arithmetic number, because the mean of its divisors is an integer number (34581627).

Almost surely, 2^138228613 is an apocalyptic number.

It is an amenable number.

138228613 is a deficient number, since it is larger than the sum of its proper divisors (97895).

138228613 is an equidigital number, since it uses as much as digits as its factorization.

138228613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97894.

The product of its digits is 13824, while the sum is 34.

The square root of 138228613 is about 11757.0665133782. The cubic root of 138228613 is about 517.0501281415.

The spelling of 138228613 in words is "one hundred thirty-eight million, two hundred twenty-eight thousand, six hundred thirteen".