685549147 has 2 divisors, whose sum is σ = 685549148. Its totient is φ = 685549146.

The previous prime is 685549141. The next prime is 685549169. The reversal of 685549147 is 741945586.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685549147 - 2⁷ = 685549019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 685549147.

It is not a weakly prime, because it can be changed into another prime (685549141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342774573 + 342774574.

It is an arithmetic number, because the mean of its divisors is an integer number (342774574).

Almost surely, 2^685549147 is an apocalyptic number.

685549147 is a deficient number, since it is larger than the sum of its proper divisors (1).

685549147 is an equidigital number, since it uses as much as digits as its factorization.

685549147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 49.

The square root of 685549147 is about 26182.9934690440. The cubic root of 685549147 is about 881.7514819765.

The spelling of 685549147 in words is "six hundred eighty-five million, five hundred forty-nine thousand, one hundred forty-seven".