138545161 has 2 divisors, whose sum is σ = 138545162. Its totient is φ = 138545160.

The previous prime is 138545129. The next prime is 138545171. The reversal of 138545161 is 161545831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113103225 + 25441936 = 10635^2 + 5044^2 .

It is a cyclic number.

It is not a de Polignac number, because 138545161 - 2⁵ = 138545129 is a prime.

It is not a weakly prime, because it can be changed into another prime (138545111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69272580 + 69272581.

It is an arithmetic number, because the mean of its divisors is an integer number (69272581).

Almost surely, 2^138545161 is an apocalyptic number.

It is an amenable number.

138545161 is a deficient number, since it is larger than the sum of its proper divisors (1).

138545161 is an equidigital number, since it uses as much as digits as its factorization.

138545161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 34.

The square root of 138545161 is about 11770.5208465896. The cubic root of 138545161 is about 517.4445144211. Note that the first 3 decimals are identical.

The spelling of 138545161 in words is "one hundred thirty-eight million, five hundred forty-five thousand, one hundred sixty-one".