138207728231 has 2 divisors, whose sum is σ = 138207728232. Its totient is φ = 138207728230.

The previous prime is 138207728179. The next prime is 138207728279. The reversal of 138207728231 is 132827702831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138207728231 is a prime.

It is a super-2 number, since 2×138207728231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138207725231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69103864115 + 69103864116.

It is an arithmetic number, because the mean of its divisors is an integer number (69103864116).

Almost surely, 2^138207728231 is an apocalyptic number.

138207728231 is a deficient number, since it is larger than the sum of its proper divisors (1).

138207728231 is an equidigital number, since it uses as much as digits as its factorization.

138207728231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 138207728231 in words is "one hundred thirty-eight billion, two hundred seven million, seven hundred twenty-eight thousand, two hundred thirty-one".