138231347 has 2 divisors, whose sum is σ = 138231348. Its totient is φ = 138231346.

The previous prime is 138231319. The next prime is 138231349. The reversal of 138231347 is 743132831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138231347 - 2¹² = 138227251 is a prime.

Together with 138231349, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138231349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69115673 + 69115674.

It is an arithmetic number, because the mean of its divisors is an integer number (69115674).

Almost surely, 2^138231347 is an apocalyptic number.

138231347 is a deficient number, since it is larger than the sum of its proper divisors (1).

138231347 is an equidigital number, since it uses as much as digits as its factorization.

138231347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 138231347 is about 11757.1827833031. The cubic root of 138231347 is about 517.0535370010.

The spelling of 138231347 in words is "one hundred thirty-eight million, two hundred thirty-one thousand, three hundred forty-seven".