138767917 has 2 divisors, whose sum is σ = 138767918. Its totient is φ = 138767916.

The previous prime is 138767899. The next prime is 138767953. The reversal of 138767917 is 719767831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102839881 + 35928036 = 10141^2 + 5994^2 .

It is a cyclic number.

It is not a de Polignac number, because 138767917 - 2⁷ = 138767789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138767977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69383958 + 69383959.

It is an arithmetic number, because the mean of its divisors is an integer number (69383959).

Almost surely, 2^138767917 is an apocalyptic number.

It is an amenable number.

138767917 is a deficient number, since it is larger than the sum of its proper divisors (1).

138767917 is an equidigital number, since it uses as much as digits as its factorization.

138767917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 49.

The square root of 138767917 is about 11779.9794991333. The cubic root of 138767917 is about 517.7216855373.

The spelling of 138767917 in words is "one hundred thirty-eight million, seven hundred sixty-seven thousand, nine hundred seventeen".