684692641 has 2 divisors, whose sum is σ = 684692642. Its totient is φ = 684692640.

The previous prime is 684692627. The next prime is 684692669. The reversal of 684692641 is 146296486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679384225 + 5308416 = 26065^2 + 2304^2 .

It is a cyclic number.

It is not a de Polignac number, because 684692641 - 2⁷ = 684692513 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 684692591 and 684692600.

It is not a weakly prime, because it can be changed into another prime (684693641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342346320 + 342346321.

It is an arithmetic number, because the mean of its divisors is an integer number (342346321).

Almost surely, 2^684692641 is an apocalyptic number.

It is an amenable number.

684692641 is a deficient number, since it is larger than the sum of its proper divisors (1).

684692641 is an equidigital number, since it uses as much as digits as its factorization.

684692641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 46.

The square root of 684692641 is about 26166.6322059221. The cubic root of 684692641 is about 881.3841170322.

The spelling of 684692641 in words is "six hundred eighty-four million, six hundred ninety-two thousand, six hundred forty-one".