138540133 has 2 divisors, whose sum is σ = 138540134. Its totient is φ = 138540132.

The previous prime is 138540041. The next prime is 138540139. The reversal of 138540133 is 331045831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134142724 + 4397409 = 11582^2 + 2097^2 .

It is a cyclic number.

It is not a de Polignac number, because 138540133 - 2²¹ = 136442981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138540139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69270066 + 69270067.

It is an arithmetic number, because the mean of its divisors is an integer number (69270067).

Almost surely, 2^138540133 is an apocalyptic number.

It is an amenable number.

138540133 is a deficient number, since it is larger than the sum of its proper divisors (1).

138540133 is an equidigital number, since it uses as much as digits as its factorization.

138540133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 138540133 is about 11770.3072602205. The cubic root of 138540133 is about 517.4382547474.

Adding to 138540133 its reverse (331045831), we get a palindrome (469585964).

The spelling of 138540133 in words is "one hundred thirty-eight million, five hundred forty thousand, one hundred thirty-three".