138709811 has 2 divisors, whose sum is σ = 138709812. Its totient is φ = 138709810.

The previous prime is 138709801. The next prime is 138709877. The reversal of 138709811 is 118907831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138709811 is a prime.

It is not a weakly prime, because it can be changed into another prime (138709801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69354905 + 69354906.

It is an arithmetic number, because the mean of its divisors is an integer number (69354906).

Almost surely, 2^138709811 is an apocalyptic number.

138709811 is a deficient number, since it is larger than the sum of its proper divisors (1).

138709811 is an equidigital number, since it uses as much as digits as its factorization.

138709811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 138709811 is about 11777.5129377980. The cubic root of 138709811 is about 517.6494139424.

The spelling of 138709811 in words is "one hundred thirty-eight million, seven hundred nine thousand, eight hundred eleven".