1284505643 has 2 divisors, whose sum is σ = 1284505644. Its totient is φ = 1284505642.

The previous prime is 1284505639. The next prime is 1284505661. The reversal of 1284505643 is 3465054821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1284505643 - 2² = 1284505639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1284505597 and 1284505606.

It is not a weakly prime, because it can be changed into another prime (1284505603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642252821 + 642252822.

It is an arithmetic number, because the mean of its divisors is an integer number (642252822).

Almost surely, 2^1284505643 is an apocalyptic number.

1284505643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284505643 is an equidigital number, since it uses as much as digits as its factorization.

1284505643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 1284505643 is about 35840.0005998884. Note that the first 3 decimals coincide. The cubic root of 1284505643 is about 1087.0395335646.

The spelling of 1284505643 in words is "one billion, two hundred eighty-four million, five hundred five thousand, six hundred forty-three".