138266507 has 2 divisors, whose sum is σ = 138266508. Its totient is φ = 138266506.

The previous prime is 138266503. The next prime is 138266509. The reversal of 138266507 is 705662831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138266507 - 2² = 138266503 is a prime.

Together with 138266509, 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 (138266503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69133253 + 69133254.

It is an arithmetic number, because the mean of its divisors is an integer number (69133254).

Almost surely, 2^138266507 is an apocalyptic number.

138266507 is a deficient number, since it is larger than the sum of its proper divisors (1).

138266507 is an equidigital number, since it uses as much as digits as its factorization.

138266507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 138266507 is about 11758.6779443949. The cubic root of 138266507 is about 517.0973718754.

The spelling of 138266507 in words is "one hundred thirty-eight million, two hundred sixty-six thousand, five hundred seven".