138533771 has 2 divisors, whose sum is σ = 138533772. Its totient is φ = 138533770.

The previous prime is 138533741. The next prime is 138533803. The reversal of 138533771 is 177335831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138533771 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138533701) 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 as a sum of consecutive naturals, namely, 69266885 + 69266886.

It is an arithmetic number, because the mean of its divisors is an integer number (69266886).

Almost surely, 2^138533771 is an apocalyptic number.

138533771 is a deficient number, since it is larger than the sum of its proper divisors (1).

138533771 is an equidigital number, since it uses as much as digits as its factorization.

138533771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 38.

The square root of 138533771 is about 11770.0370007915. The cubic root of 138533771 is about 517.4303340761.

The spelling of 138533771 in words is "one hundred thirty-eight million, five hundred thirty-three thousand, seven hundred seventy-one".