685377841 has 2 divisors, whose sum is σ = 685377842. Its totient is φ = 685377840.

The previous prime is 685377811. The next prime is 685377859. The reversal of 685377841 is 148773586.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668739600 + 16638241 = 25860^2 + 4079^2 .

It is a cyclic number.

It is not a de Polignac number, because 685377841 - 2¹¹ = 685375793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (685377811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342688920 + 342688921.

It is an arithmetic number, because the mean of its divisors is an integer number (342688921).

Almost surely, 2^685377841 is an apocalyptic number.

It is an amenable number.

685377841 is a deficient number, since it is larger than the sum of its proper divisors (1).

685377841 is an equidigital number, since it uses as much as digits as its factorization.

685377841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 49.

The square root of 685377841 is about 26179.7219427556. The cubic root of 685377841 is about 881.6780314183.

The spelling of 685377841 in words is "six hundred eighty-five million, three hundred seventy-seven thousand, eight hundred forty-one".