138716231 has 2 divisors, whose sum is σ = 138716232. Its totient is φ = 138716230.

The previous prime is 138716203. The next prime is 138716239. The reversal of 138716231 is 132617831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138716231 is a prime.

It is a super-2 number, since 2×138716231² = 38484385485690722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138716239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69358115 + 69358116.

It is an arithmetic number, because the mean of its divisors is an integer number (69358116).

Almost surely, 2^138716231 is an apocalyptic number.

138716231 is a deficient number, since it is larger than the sum of its proper divisors (1).

138716231 is an equidigital number, since it uses as much as digits as its factorization.

138716231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 138716231 is about 11777.7854879430. The cubic root of 138716231 is about 517.6574000585.

It can be divided in two parts, 13871 and 6231, that added together give a palindrome (20102).

The spelling of 138716231 in words is "one hundred thirty-eight million, seven hundred sixteen thousand, two hundred thirty-one".