138088231 has 2 divisors, whose sum is σ = 138088232. Its totient is φ = 138088230.

The previous prime is 138088211. The next prime is 138088253. The reversal of 138088231 is 132880831.

138088231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138088231 - 2⁵ = 138088199 is a prime.

It is a super-2 number, since 2×138088231² = 38136719081418722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138088211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69044115 + 69044116.

It is an arithmetic number, because the mean of its divisors is an integer number (69044116).

Almost surely, 2^138088231 is an apocalyptic number.

138088231 is a deficient number, since it is larger than the sum of its proper divisors (1).

138088231 is an equidigital number, since it uses as much as digits as its factorization.

138088231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 138088231 is about 11751.0948851586. The cubic root of 138088231 is about 516.8750338656.

The spelling of 138088231 in words is "one hundred thirty-eight million, eighty-eight thousand, two hundred thirty-one".