685433261 has 2 divisors, whose sum is σ = 685433262. Its totient is φ = 685433260.

The previous prime is 685433237. The next prime is 685433279. The reversal of 685433261 is 162334586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 589275625 + 96157636 = 24275^2 + 9806^2 .

It is a cyclic number.

It is not a de Polignac number, because 685433261 - 2⁶ = 685433197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685433291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342716630 + 342716631.

It is an arithmetic number, because the mean of its divisors is an integer number (342716631).

Almost surely, 2^685433261 is an apocalyptic number.

It is an amenable number.

685433261 is a deficient number, since it is larger than the sum of its proper divisors (1).

685433261 is an equidigital number, since it uses as much as digits as its factorization.

685433261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 38.

The square root of 685433261 is about 26180.7803741600. The cubic root of 685433261 is about 881.7017950888.

The spelling of 685433261 in words is "six hundred eighty-five million, four hundred thirty-three thousand, two hundred sixty-one".