685163449 has 2 divisors, whose sum is σ = 685163450. Its totient is φ = 685163448.

The previous prime is 685163417. The next prime is 685163459. The reversal of 685163449 is 944361586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639735849 + 45427600 = 25293^2 + 6740^2 .

It is a cyclic number.

It is not a de Polignac number, because 685163449 - 2⁵ = 685163417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 685163399 and 685163408.

It is not a weakly prime, because it can be changed into another prime (685163459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342581724 + 342581725.

It is an arithmetic number, because the mean of its divisors is an integer number (342581725).

Almost surely, 2^685163449 is an apocalyptic number.

It is an amenable number.

685163449 is a deficient number, since it is larger than the sum of its proper divisors (1).

685163449 is an equidigital number, since it uses as much as digits as its factorization.

685163449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 46.

The square root of 685163449 is about 26175.6270029965. The cubic root of 685163449 is about 881.5860897095.

The spelling of 685163449 in words is "six hundred eighty-five million, one hundred sixty-three thousand, four hundred forty-nine".