138918953 has 2 divisors, whose sum is σ = 138918954. Its totient is φ = 138918952.

The previous prime is 138918931. The next prime is 138918971. The reversal of 138918953 is 359819831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120187369 + 18731584 = 10963^2 + 4328^2 .

It is a cyclic number.

It is not a de Polignac number, because 138918953 - 2¹⁶ = 138853417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138918898 and 138918907.

It is not a weakly prime, because it can be changed into another prime (138918973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69459476 + 69459477.

It is an arithmetic number, because the mean of its divisors is an integer number (69459477).

Almost surely, 2^138918953 is an apocalyptic number.

It is an amenable number.

138918953 is a deficient number, since it is larger than the sum of its proper divisors (1).

138918953 is an equidigital number, since it uses as much as digits as its factorization.

138918953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 47.

The square root of 138918953 is about 11786.3884629686. The cubic root of 138918953 is about 517.9094481032.

The spelling of 138918953 in words is "one hundred thirty-eight million, nine hundred eighteen thousand, nine hundred fifty-three".