1285564121 has 2 divisors, whose sum is σ = 1285564122. Its totient is φ = 1285564120.

The previous prime is 1285564117. The next prime is 1285564151. The reversal of 1285564121 is 1214655821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1060414096 + 225150025 = 32564^2 + 15005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285564121 - 2² = 1285564117 is a prime.

It is not a weakly prime, because it can be changed into another prime (1285564151) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642782060 + 642782061.

It is an arithmetic number, because the mean of its divisors is an integer number (642782061).

Almost surely, 2^1285564121 is an apocalyptic number.

It is an amenable number.

1285564121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285564121 is an equidigital number, since it uses as much as digits as its factorization.

1285564121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 35.

The square root of 1285564121 is about 35854.7642719904. The cubic root of 1285564121 is about 1087.3380379050.

The spelling of 1285564121 in words is "one billion, two hundred eighty-five million, five hundred sixty-four thousand, one hundred twenty-one".