138257263 has 2 divisors, whose sum is σ = 138257264. Its totient is φ = 138257262.

The previous prime is 138257233. The next prime is 138257321. The reversal of 138257263 is 362752831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138257263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138257233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69128631 + 69128632.

It is an arithmetic number, because the mean of its divisors is an integer number (69128632).

Almost surely, 2^138257263 is an apocalyptic number.

138257263 is a deficient number, since it is larger than the sum of its proper divisors (1).

138257263 is an equidigital number, since it uses as much as digits as its factorization.

138257263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 138257263 is about 11758.2848664250. The cubic root of 138257263 is about 517.0858478635.

The spelling of 138257263 in words is "one hundred thirty-eight million, two hundred fifty-seven thousand, two hundred sixty-three".