138257233 has 2 divisors, whose sum is σ = 138257234. Its totient is φ = 138257232.

The previous prime is 138257219. The next prime is 138257263. The reversal of 138257233 is 332752831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79780624 + 58476609 = 8932^2 + 7647^2 .

It is a cyclic number.

It is not a de Polignac number, because 138257233 - 2⁹ = 138256721 is a prime.

It is not a weakly prime, because it can be changed into another prime (138257263) 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, 69128616 + 69128617.

It is an arithmetic number, because the mean of its divisors is an integer number (69128617).

Almost surely, 2^138257233 is an apocalyptic number.

It is an amenable number.

138257233 is a deficient number, since it is larger than the sum of its proper divisors (1).

138257233 is an equidigital number, since it uses as much as digits as its factorization.

138257233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 34.

The square root of 138257233 is about 11758.2835907287. The cubic root of 138257233 is about 517.0858104632.

The spelling of 138257233 in words is "one hundred thirty-eight million, two hundred fifty-seven thousand, two hundred thirty-three".