138257311 has 6 divisors (see below), whose sum is σ = 146868800. Its totient is φ = 130124256.

The previous prime is 138257263. The next prime is 138257321. The reversal of 138257311 is 113752831.

It is not a de Polignac number, because 138257311 - 2¹¹ = 138255263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138257321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 238911 + ... + 239488.

Almost surely, 2^138257311 is an apocalyptic number.

138257311 is a deficient number, since it is larger than the sum of its proper divisors (8611489).

138257311 is an equidigital number, since it uses as much as digits as its factorization.

138257311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478433 (or 478416 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The square root of 138257311 is about 11758.2869075389. The cubic root of 138257311 is about 517.0859077039.

The spelling of 138257311 in words is "one hundred thirty-eight million, two hundred fifty-seven thousand, three hundred eleven".