1921445563 has 2 divisors, whose sum is σ = 1921445564. Its totient is φ = 1921445562.

The previous prime is 1921445551. The next prime is 1921445579. The reversal of 1921445563 is 3655441291.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921445563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1921445543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960722781 + 960722782.

It is an arithmetic number, because the mean of its divisors is an integer number (960722782).

Almost surely, 2^1921445563 is an apocalyptic number.

1921445563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921445563 is an equidigital number, since it uses as much as digits as its factorization.

1921445563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 40.

The square root of 1921445563 is about 43834.2966522790. The cubic root of 1921445563 is about 1243.2048477670.

The spelling of 1921445563 in words is "one billion, nine hundred twenty-one million, four hundred forty-five thousand, five hundred sixty-three".