138831263 has 2 divisors, whose sum is σ = 138831264. Its totient is φ = 138831262.

The previous prime is 138831247. The next prime is 138831283. The reversal of 138831263 is 362138831.

138831263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138831263 - 2⁴ = 138831247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138831283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69415631 + 69415632.

It is an arithmetic number, because the mean of its divisors is an integer number (69415632).

Almost surely, 2^138831263 is an apocalyptic number.

138831263 is a deficient number, since it is larger than the sum of its proper divisors (1).

138831263 is an equidigital number, since it uses as much as digits as its factorization.

138831263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 138831263 is about 11782.6679067179. The cubic root of 138831263 is about 517.8004516037.

The spelling of 138831263 in words is "one hundred thirty-eight million, eight hundred thirty-one thousand, two hundred sixty-three".