685911481 has 2 divisors, whose sum is σ = 685911482. Its totient is φ = 685911480.

The previous prime is 685911463. The next prime is 685911493. The reversal of 685911481 is 184119586.

685911481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 435765625 + 250145856 = 20875^2 + 15816^2 .

It is a cyclic number.

It is not a de Polignac number, because 685911481 - 2⁵ = 685911449 is a prime.

It is a super-2 number, since 2×685911481² = 940949119535226722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (685911781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342955740 + 342955741.

It is an arithmetic number, because the mean of its divisors is an integer number (342955741).

Almost surely, 2^685911481 is an apocalyptic number.

It is an amenable number.

685911481 is a deficient number, since it is larger than the sum of its proper divisors (1).

685911481 is an equidigital number, since it uses as much as digits as its factorization.

685911481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 43.

The square root of 685911481 is about 26189.9118173391. The cubic root of 685911481 is about 881.9067989574.

The spelling of 685911481 in words is "six hundred eighty-five million, nine hundred eleven thousand, four hundred eighty-one".