138076321 has 2 divisors, whose sum is σ = 138076322. Its totient is φ = 138076320.

The previous prime is 138076307. The next prime is 138076333. The reversal of 138076321 is 123670831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101304225 + 36772096 = 10065^2 + 6064^2 .

It is an emirp because it is prime and its reverse (123670831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138076321 - 2¹³ = 138068129 is a prime.

It is not a weakly prime, because it can be changed into another prime (138076381) 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, 69038160 + 69038161.

It is an arithmetic number, because the mean of its divisors is an integer number (69038161).

Almost surely, 2^138076321 is an apocalyptic number.

It is an amenable number.

138076321 is a deficient number, since it is larger than the sum of its proper divisors (1).

138076321 is an equidigital number, since it uses as much as digits as its factorization.

138076321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 138076321 is about 11750.5881129414. The cubic root of 138076321 is about 516.8601734183.

The spelling of 138076321 in words is "one hundred thirty-eight million, seventy-six thousand, three hundred twenty-one".