1225281643 has 2 divisors, whose sum is σ = 1225281644. Its totient is φ = 1225281642.

The previous prime is 1225281623. The next prime is 1225281731. The reversal of 1225281643 is 3461825221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1225281643 - 2⁹ = 1225281131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1225281599 and 1225281608.

It is not a weakly prime, because it can be changed into another prime (1225281623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612640821 + 612640822.

It is an arithmetic number, because the mean of its divisors is an integer number (612640822).

Almost surely, 2^1225281643 is an apocalyptic number.

1225281643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225281643 is an equidigital number, since it uses as much as digits as its factorization.

1225281643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 34.

The square root of 1225281643 is about 35004.0232401934. The cubic root of 1225281643 is about 1070.0694755016.

The spelling of 1225281643 in words is "one billion, two hundred twenty-five million, two hundred eighty-one thousand, six hundred forty-three".