138228061 has 2 divisors, whose sum is σ = 138228062. Its totient is φ = 138228060.

The previous prime is 138228053. The next prime is 138228067. The reversal of 138228061 is 160822831.

138228061 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., 90535225 + 47692836 = 9515^2 + 6906^2 .

It is a cyclic number.

It is not a de Polignac number, because 138228061 - 2³ = 138228053 is a prime.

It is a Chen prime.

It is equal to p_7817611 and since 138228061 and 7817611 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138228067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69114030 + 69114031.

It is an arithmetic number, because the mean of its divisors is an integer number (69114031).

Almost surely, 2^138228061 is an apocalyptic number.

It is an amenable number.

138228061 is a deficient number, since it is larger than the sum of its proper divisors (1).

138228061 is an equidigital number, since it uses as much as digits as its factorization.

138228061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 138228061 is about 11757.0430381112. The cubic root of 138228061 is about 517.0494398806.

The spelling of 138228061 in words is "one hundred thirty-eight million, two hundred twenty-eight thousand, sixty-one".