684673331 has 2 divisors, whose sum is σ = 684673332. Its totient is φ = 684673330.

The previous prime is 684673321. The next prime is 684673337. The reversal of 684673331 is 133376486.

684673331 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 684673331 - 2²² = 680479027 is a prime.

It is a super-2 number, since 2×684673331² = 937555140365271122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (684673337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342336665 + 342336666.

It is an arithmetic number, because the mean of its divisors is an integer number (342336666).

Almost surely, 2^684673331 is an apocalyptic number.

684673331 is a deficient number, since it is larger than the sum of its proper divisors (1).

684673331 is an equidigital number, since it uses as much as digits as its factorization.

684673331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 41.

The square root of 684673331 is about 26166.2632219429. The cubic root of 684673331 is about 881.3758312281.

The spelling of 684673331 in words is "six hundred eighty-four million, six hundred seventy-three thousand, three hundred thirty-one".