138968233 has 2 divisors, whose sum is σ = 138968234. Its totient is φ = 138968232.

The previous prime is 138968227. The next prime is 138968281. The reversal of 138968233 is 332869831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136118889 + 2849344 = 11667^2 + 1688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138968233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138968233.

It is not a weakly prime, because it can be changed into another prime (138968213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69484116 + 69484117.

It is an arithmetic number, because the mean of its divisors is an integer number (69484117).

Almost surely, 2^138968233 is an apocalyptic number.

It is an amenable number.

138968233 is a deficient number, since it is larger than the sum of its proper divisors (1).

138968233 is an equidigital number, since it uses as much as digits as its factorization.

138968233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The square root of 138968233 is about 11788.4788246830. The cubic root of 138968233 is about 517.9706817930.

The spelling of 138968233 in words is "one hundred thirty-eight million, nine hundred sixty-eight thousand, two hundred thirty-three".