138481663 has 2 divisors, whose sum is σ = 138481664. Its totient is φ = 138481662.

The previous prime is 138481661. The next prime is 138481687. The reversal of 138481663 is 366184831.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (366184831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138481663 - 2¹ = 138481661 is a prime.

Together with 138481661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138481661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69240831 + 69240832.

It is an arithmetic number, because the mean of its divisors is an integer number (69240832).

Almost surely, 2^138481663 is an apocalyptic number.

138481663 is a deficient number, since it is larger than the sum of its proper divisors (1).

138481663 is an equidigital number, since it uses as much as digits as its factorization.

138481663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 40.

The square root of 138481663 is about 11767.8232056740. The cubic root of 138481663 is about 517.3654506404.

The spelling of 138481663 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, six hundred sixty-three".