1285021 has 2 divisors, whose sum is σ = 1285022. Its totient is φ = 1285020.

The previous prime is 1284991. The next prime is 1285049. The reversal of 1285021 is 1205821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1179396 + 105625 = 1086^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285021 - 2¹³ = 1276829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1285021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642510 + 642511.

It is an arithmetic number, because the mean of its divisors is an integer number (642511).

2^1285021 is an apocalyptic number.

It is an amenable number.

1285021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285021 is an equidigital number, since it uses as much as digits as its factorization.

1285021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1285021 is about 1133.5876675405. The cubic root of 1285021 is about 108.7184891309.

The spelling of 1285021 in words is "one million, two hundred eighty-five thousand, twenty-one".