138782311 has 2 divisors, whose sum is σ = 138782312. Its totient is φ = 138782310.

The previous prime is 138782309. The next prime is 138782321. The reversal of 138782311 is 113287831.

It is a weak prime.

It is an emirp because it is prime and its reverse (113287831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138782311 - 2¹ = 138782309 is a prime.

Together with 138782309, it forms a pair of twin primes.

It is equal to p_7847143 and since 138782311 and 7847143 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138782321) 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, 69391155 + 69391156.

It is an arithmetic number, because the mean of its divisors is an integer number (69391156).

Almost surely, 2^138782311 is an apocalyptic number.

138782311 is a deficient number, since it is larger than the sum of its proper divisors (1).

138782311 is an equidigital number, since it uses as much as digits as its factorization.

138782311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 138782311 is about 11780.5904351183. The cubic root of 138782311 is about 517.7395855161.

The spelling of 138782311 in words is "one hundred thirty-eight million, seven hundred eighty-two thousand, three hundred eleven".