685390811 has 16 divisors (see below), whose sum is σ = 811235328. Its totient is φ = 566654400.

The previous prime is 685390799. The next prime is 685390829. The reversal of 685390811 is 118093586.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685390811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685390841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62876 + ... + 72966.

It is an arithmetic number, because the mean of its divisors is an integer number (50702208).

Almost surely, 2^685390811 is an apocalyptic number.

685390811 is a deficient number, since it is larger than the sum of its proper divisors (125844517).

685390811 is a wasteful number, since it uses less digits than its factorization.

685390811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10442.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 685390811 is about 26179.9696523888. The cubic root of 685390811 is about 881.6835929695.

The spelling of 685390811 in words is "six hundred eighty-five million, three hundred ninety thousand, eight hundred eleven".