138331541 has 2 divisors, whose sum is σ = 138331542. Its totient is φ = 138331540.

The previous prime is 138331513. The next prime is 138331547. The reversal of 138331541 is 145133831.

138331541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133287025 + 5044516 = 11545^2 + 2246^2 .

It is an emirp because it is prime and its reverse (145133831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138331541 - 2²⁶ = 71222677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138331547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69165770 + 69165771.

It is an arithmetic number, because the mean of its divisors is an integer number (69165771).

Almost surely, 2^138331541 is an apocalyptic number.

It is an amenable number.

138331541 is a deficient number, since it is larger than the sum of its proper divisors (1).

138331541 is an equidigital number, since it uses as much as digits as its factorization.

138331541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 138331541 is about 11761.4429811992. The cubic root of 138331541 is about 517.1784318518.

The spelling of 138331541 in words is "one hundred thirty-eight million, three hundred thirty-one thousand, five hundred forty-one".