139783321 has 2 divisors, whose sum is σ = 139783322. Its totient is φ = 139783320.

The previous prime is 139783291. The next prime is 139783339. The reversal of 139783321 is 123387931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99600400 + 40182921 = 9980^2 + 6339^2 .

It is an emirp because it is prime and its reverse (123387931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139783321 - 2⁵ = 139783289 is a prime.

It is not a weakly prime, because it can be changed into another prime (139783381) 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, 69891660 + 69891661.

It is an arithmetic number, because the mean of its divisors is an integer number (69891661).

Almost surely, 2^139783321 is an apocalyptic number.

It is an amenable number.

139783321 is a deficient number, since it is larger than the sum of its proper divisors (1).

139783321 is an equidigital number, since it uses as much as digits as its factorization.

139783321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 139783321 is about 11822.9996616764. Note that the first 3 decimals coincide. The cubic root of 139783321 is about 518.9813898582.

The spelling of 139783321 in words is "one hundred thirty-nine million, seven hundred eighty-three thousand, three hundred twenty-one".