684131353 has 2 divisors, whose sum is σ = 684131354. Its totient is φ = 684131352.

The previous prime is 684131213. The next prime is 684131359. The reversal of 684131353 is 353131486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 683717904 + 413449 = 26148^2 + 643^2 .

It is a cyclic number.

It is not a de Polignac number, because 684131353 - 2¹⁷ = 684000281 is a prime.

It is a super-2 number, since 2×684131353² = 936071416315221218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (684131359) 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, 342065676 + 342065677.

It is an arithmetic number, because the mean of its divisors is an integer number (342065677).

Almost surely, 2^684131353 is an apocalyptic number.

It is an amenable number.

684131353 is a deficient number, since it is larger than the sum of its proper divisors (1).

684131353 is an equidigital number, since it uses as much as digits as its factorization.

684131353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 684131353 is about 26155.9047444358. The cubic root of 684131353 is about 881.1432081715.

The spelling of 684131353 in words is "six hundred eighty-four million, one hundred thirty-one thousand, three hundred fifty-three".