685324961 has 8 divisors (see below), whose sum is σ = 725995944. Its totient is φ = 644693760.

The previous prime is 685324933. The next prime is 685325021. The reversal of 685324961 is 169423586.

It can be written as a sum of positive squares in 4 ways, for example, as 61324561 + 624000400 = 7831^2 + 24980^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685324961 - 2¹⁴ = 685308577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685324931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30191 + ... + 47771.

It is an arithmetic number, because the mean of its divisors is an integer number (90749493).

Almost surely, 2^685324961 is an apocalyptic number.

It is an amenable number.

685324961 is a deficient number, since it is larger than the sum of its proper divisors (40670983).

685324961 is a wasteful number, since it uses less digits than its factorization.

685324961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19891.

The product of its digits is 311040, while the sum is 44.

The square root of 685324961 is about 26178.7119813027. The cubic root of 685324961 is about 881.6553556859.

The spelling of 685324961 in words is "six hundred eighty-five million, three hundred twenty-four thousand, nine hundred sixty-one".