138475313 has 2 divisors, whose sum is σ = 138475314. Its totient is φ = 138475312.

The previous prime is 138475303. The next prime is 138475321. The reversal of 138475313 is 313574831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104509729 + 33965584 = 10223^2 + 5828^2 .

It is a cyclic number.

It is not a de Polignac number, because 138475313 - 2⁴ = 138475297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (138475303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69237656 + 69237657.

It is an arithmetic number, because the mean of its divisors is an integer number (69237657).

Almost surely, 2^138475313 is an apocalyptic number.

It is an amenable number.

138475313 is a deficient number, since it is larger than the sum of its proper divisors (1).

138475313 is an equidigital number, since it uses as much as digits as its factorization.

138475313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 138475313 is about 11767.5533990715. The cubic root of 138475313 is about 517.3575426841.

The spelling of 138475313 in words is "one hundred thirty-eight million, four hundred seventy-five thousand, three hundred thirteen".