138527231 has 2 divisors, whose sum is σ = 138527232. Its totient is φ = 138527230.

The previous prime is 138527219. The next prime is 138527243. The reversal of 138527231 is 132725831.

138527231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (138527219) and next prime (138527243).

It is a cyclic number.

It is not a de Polignac number, because 138527231 - 2⁶ = 138527167 is a prime.

It is a super-2 number, since 2×138527231² = 38379587457054722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138527201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69263615 + 69263616.

It is an arithmetic number, because the mean of its divisors is an integer number (69263616).

Almost surely, 2^138527231 is an apocalyptic number.

138527231 is a deficient number, since it is larger than the sum of its proper divisors (1).

138527231 is an equidigital number, since it uses as much as digits as its factorization.

138527231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 138527231 is about 11769.7591734071. The cubic root of 138527231 is about 517.4221915426.

The spelling of 138527231 in words is "one hundred thirty-eight million, five hundred twenty-seven thousand, two hundred thirty-one".