685428461 has 2 divisors, whose sum is σ = 685428462. Its totient is φ = 685428460.

The previous prime is 685428437. The next prime is 685428487. The reversal of 685428461 is 164824586.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595652836 + 89775625 = 24406^2 + 9475^2 .

It is a cyclic number.

It is not a de Polignac number, because 685428461 - 2⁶ = 685428397 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 (685428431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342714230 + 342714231.

It is an arithmetic number, because the mean of its divisors is an integer number (342714231).

Almost surely, 2^685428461 is an apocalyptic number.

It is an amenable number.

685428461 is a deficient number, since it is larger than the sum of its proper divisors (1).

685428461 is an equidigital number, since it uses as much as digits as its factorization.

685428461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 368640, while the sum is 44.

The square root of 685428461 is about 26180.6887036991. The cubic root of 685428461 is about 881.6997369363.

The spelling of 685428461 in words is "six hundred eighty-five million, four hundred twenty-eight thousand, four hundred sixty-one".