285247661 has 2 divisors, whose sum is σ = 285247662. Its totient is φ = 285247660.

The previous prime is 285247657. The next prime is 285247693. The reversal of 285247661 is 166742582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199685161 + 85562500 = 14131^2 + 9250^2 .

It is a cyclic number.

It is not a de Polignac number, because 285247661 - 2² = 285247657 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285247601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142623830 + 142623831.

It is an arithmetic number, because the mean of its divisors is an integer number (142623831).

Almost surely, 2^285247661 is an apocalyptic number.

It is an amenable number.

285247661 is a deficient number, since it is larger than the sum of its proper divisors (1).

285247661 is an equidigital number, since it uses as much as digits as its factorization.

285247661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 41.

The square root of 285247661 is about 16889.2765090752. The cubic root of 285247661 is about 658.2750033812.

The spelling of 285247661 in words is "two hundred eighty-five million, two hundred forty-seven thousand, six hundred sixty-one".