138771473 has 2 divisors, whose sum is σ = 138771474. Its totient is φ = 138771472.

The previous prime is 138771463. The next prime is 138771487. The reversal of 138771473 is 374177831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126855169 + 11916304 = 11263^2 + 3452^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138771473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138771473.

It is not a weakly prime, because it can be changed into another prime (138771463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69385736 + 69385737.

It is an arithmetic number, because the mean of its divisors is an integer number (69385737).

Almost surely, 2^138771473 is an apocalyptic number.

It is an amenable number.

138771473 is a deficient number, since it is larger than the sum of its proper divisors (1).

138771473 is an equidigital number, since it uses as much as digits as its factorization.

138771473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 41.

The square root of 138771473 is about 11780.1304322151. The cubic root of 138771473 is about 517.7261077953.

The spelling of 138771473 in words is "one hundred thirty-eight million, seven hundred seventy-one thousand, four hundred seventy-three".