138372317 has 2 divisors, whose sum is σ = 138372318. Its totient is φ = 138372316.

The previous prime is 138372257. The next prime is 138372331. The reversal of 138372317 is 713273831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134815321 + 3556996 = 11611^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 138372317 - 2¹⁰ = 138371293 is a prime.

It is a super-2 number, since 2×138372317² = 38293796223896978, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138372517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69186158 + 69186159.

It is an arithmetic number, because the mean of its divisors is an integer number (69186159).

Almost surely, 2^138372317 is an apocalyptic number.

It is an amenable number.

138372317 is a deficient number, since it is larger than the sum of its proper divisors (1).

138372317 is an equidigital number, since it uses as much as digits as its factorization.

138372317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 35.

The square root of 138372317 is about 11763.1763142444. The cubic root of 138372317 is about 517.2292431029.

The spelling of 138372317 in words is "one hundred thirty-eight million, three hundred seventy-two thousand, three hundred seventeen".