684845243 has 2 divisors, whose sum is σ = 684845244. Its totient is φ = 684845242.

The previous prime is 684845137. The next prime is 684845267. The reversal of 684845243 is 342548486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684845243 - 2²² = 680650939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 684845194 and 684845203.

It is not a weakly prime, because it can be changed into another prime (684845743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342422621 + 342422622.

It is an arithmetic number, because the mean of its divisors is an integer number (342422622).

Almost surely, 2^684845243 is an apocalyptic number.

684845243 is a deficient number, since it is larger than the sum of its proper divisors (1).

684845243 is an equidigital number, since it uses as much as digits as its factorization.

684845243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 737280, while the sum is 44.

The square root of 684845243 is about 26169.5480090887. The cubic root of 684845243 is about 881.4495921471.

The spelling of 684845243 in words is "six hundred eighty-four million, eight hundred forty-five thousand, two hundred forty-three".