138213941 has 2 divisors, whose sum is σ = 138213942. Its totient is φ = 138213940.

The previous prime is 138213937. The next prime is 138213947. The reversal of 138213941 is 149312831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128165041 + 10048900 = 11321^2 + 3170^2 .

It is an emirp because it is prime and its reverse (149312831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138213941 - 2² = 138213937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138213898 and 138213907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138213947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69106970 + 69106971.

It is an arithmetic number, because the mean of its divisors is an integer number (69106971).

Almost surely, 2^138213941 is an apocalyptic number.

It is an amenable number.

138213941 is a deficient number, since it is larger than the sum of its proper divisors (1).

138213941 is an equidigital number, since it uses as much as digits as its factorization.

138213941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 138213941 is about 11756.4425316505. The cubic root of 138213941 is about 517.0318337433.

The spelling of 138213941 in words is "one hundred thirty-eight million, two hundred thirteen thousand, nine hundred forty-one".