1282685221 has 2 divisors, whose sum is σ = 1282685222. Its totient is φ = 1282685220.

The previous prime is 1282685213. The next prime is 1282685249. The reversal of 1282685221 is 1225862821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 944640225 + 338044996 = 30735^2 + 18386^2 .

It is an emirp because it is prime and its reverse (1225862821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1282685221 - 2³ = 1282685213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1282685821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641342610 + 641342611.

It is an arithmetic number, because the mean of its divisors is an integer number (641342611).

Almost surely, 2^1282685221 is an apocalyptic number.

It is an amenable number.

1282685221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1282685221 is an equidigital number, since it uses as much as digits as its factorization.

1282685221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 37.

The square root of 1282685221 is about 35814.5950835689. The cubic root of 1282685221 is about 1086.5257674948.

The spelling of 1282685221 in words is "one billion, two hundred eighty-two million, six hundred eighty-five thousand, two hundred twenty-one".