684571331 has 2 divisors, whose sum is σ = 684571332. Its totient is φ = 684571330.

The previous prime is 684571259. The next prime is 684571337. The reversal of 684571331 is 133175486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684571331 - 2¹⁰ = 684570307 is a prime.

It is a super-2 number, since 2×684571331² = 937275814454223122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (684571337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342285665 + 342285666.

It is an arithmetic number, because the mean of its divisors is an integer number (342285666).

Almost surely, 2^684571331 is an apocalyptic number.

684571331 is a deficient number, since it is larger than the sum of its proper divisors (1).

684571331 is an equidigital number, since it uses as much as digits as its factorization.

684571331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 684571331 is about 26164.3140747087. The cubic root of 684571331 is about 881.3320610604.

The spelling of 684571331 in words is "six hundred eighty-four million, five hundred seventy-one thousand, three hundred thirty-one".