138147989544491 has 2 divisors, whose sum is σ = 138147989544492. Its totient is φ = 138147989544490.

The previous prime is 138147989544457. The next prime is 138147989544557. The reversal of 138147989544491 is 194445989741831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138147989544491 - 2²² = 138147985350187 is a prime.

It is not a weakly prime, because it can be changed into another prime (138147989544791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69073994772245 + 69073994772246.

It is an arithmetic number, because the mean of its divisors is an integer number (69073994772246).

Almost surely, 2^{138147989544491} is an apocalyptic number.

138147989544491 is a deficient number, since it is larger than the sum of its proper divisors (1).

138147989544491 is an equidigital number, since it uses as much as digits as its factorization.

138147989544491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1254113280, while the sum is 77.

The spelling of 138147989544491 in words is "one hundred thirty-eight trillion, one hundred forty-seven billion, nine hundred eighty-nine million, five hundred forty-four thousand, four hundred ninety-one".