684573139 has 2 divisors, whose sum is σ = 684573140. Its totient is φ = 684573138.

The previous prime is 684573107. The next prime is 684573161. The reversal of 684573139 is 931375486.

684573139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684573139 - 2⁵ = 684573107 is a prime.

It is not a weakly prime, because it can be changed into another prime (684553139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342286569 + 342286570.

It is an arithmetic number, because the mean of its divisors is an integer number (342286570).

Almost surely, 2^684573139 is an apocalyptic number.

684573139 is a deficient number, since it is larger than the sum of its proper divisors (1).

684573139 is an equidigital number, since it uses as much as digits as its factorization.

684573139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 46.

The square root of 684573139 is about 26164.3486255630. The cubic root of 684573139 is about 881.3328369460.

The spelling of 684573139 in words is "six hundred eighty-four million, five hundred seventy-three thousand, one hundred thirty-nine".