138861281227 has 2 divisors, whose sum is σ = 138861281228. Its totient is φ = 138861281226.

The previous prime is 138861281149. The next prime is 138861281231. The reversal of 138861281227 is 722182168831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138861281227 - 2³¹ = 136713797579 is a prime.

It is not a weakly prime, because it can be changed into another prime (138861281287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69430640613 + 69430640614.

It is an arithmetic number, because the mean of its divisors is an integer number (69430640614).

Almost surely, 2^138861281227 is an apocalyptic number.

138861281227 is a deficient number, since it is larger than the sum of its proper divisors (1).

138861281227 is an equidigital number, since it uses as much as digits as its factorization.

138861281227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 49.

The spelling of 138861281227 in words is "one hundred thirty-eight billion, eight hundred sixty-one million, two hundred eighty-one thousand, two hundred twenty-seven".