685889147 has 2 divisors, whose sum is σ = 685889148. Its totient is φ = 685889146.

The previous prime is 685889119. The next prime is 685889209. The reversal of 685889147 is 741988586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685889147 - 2⁸ = 685888891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 685889092 and 685889101.

It is not a weakly prime, because it can be changed into another prime (685889047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342944573 + 342944574.

It is an arithmetic number, because the mean of its divisors is an integer number (342944574).

Almost surely, 2^685889147 is an apocalyptic number.

685889147 is a deficient number, since it is larger than the sum of its proper divisors (1).

685889147 is an equidigital number, since it uses as much as digits as its factorization.

685889147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 56.

The square root of 685889147 is about 26189.4854283165. The cubic root of 685889147 is about 881.8972269156.

The spelling of 685889147 in words is "six hundred eighty-five million, eight hundred eighty-nine thousand, one hundred forty-seven".