138641 has 2 divisors, whose sum is σ = 138642. Its totient is φ = 138640.

The previous prime is 138637. The next prime is 138647. The reversal of 138641 is 146831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92416 + 46225 = 304^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 138641 - 2² = 138637 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69320 + 69321.

It is an arithmetic number, because the mean of its divisors is an integer number (69321).

2¹³⁸⁶⁴¹ is an apocalyptic number.

It is an amenable number.

138641 is a deficient number, since it is larger than the sum of its proper divisors (1).

138641 is an equidigital number, since it uses as much as digits as its factorization.

138641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 138641 is about 372.3452698773. The cubic root of 138641 is about 51.7563801480.

The spelling of 138641 in words is "one hundred thirty-eight thousand, six hundred forty-one".