685845541 has 2 divisors, whose sum is σ = 685845542. Its totient is φ = 685845540.

The previous prime is 685845521. The next prime is 685845547. The reversal of 685845541 is 145548586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 680688100 + 5157441 = 26090^2 + 2271^2 .

It is a cyclic number.

It is not a de Polignac number, because 685845541 - 2⁹ = 685845029 is a prime.

It is a super-2 number, since 2×685845541² = 940768212219165362, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 685845491 and 685845500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685845547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342922770 + 342922771.

It is an arithmetic number, because the mean of its divisors is an integer number (342922771).

Almost surely, 2^685845541 is an apocalyptic number.

It is an amenable number.

685845541 is a deficient number, since it is larger than the sum of its proper divisors (1).

685845541 is an equidigital number, since it uses as much as digits as its factorization.

685845541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768000, while the sum is 46.

The square root of 685845541 is about 26188.6529054092. The cubic root of 685845541 is about 881.8785373914.

The spelling of 685845541 in words is "six hundred eighty-five million, eight hundred forty-five thousand, five hundred forty-one".