1563799481 has 2 divisors, whose sum is σ = 1563799482. Its totient is φ = 1563799480.

The previous prime is 1563799453. The next prime is 1563799493. The reversal of 1563799481 is 1849973651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 901200400 + 662599081 = 30020^2 + 25741^2 .

It is a cyclic number.

It is not a de Polignac number, because 1563799481 - 2²⁶ = 1496690617 is a prime.

It is a super-2 number, since 2×1563799481² = 4890937633551738722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1563799411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 781899740 + 781899741.

It is an arithmetic number, because the mean of its divisors is an integer number (781899741).

Almost surely, 2^1563799481 is an apocalyptic number.

It is an amenable number.

1563799481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1563799481 is an equidigital number, since it uses as much as digits as its factorization.

1563799481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 53.

The square root of 1563799481 is about 39544.9046148805. The cubic root of 1563799481 is about 1160.7188076117.

The spelling of 1563799481 in words is "one billion, five hundred sixty-three million, seven hundred ninety-nine thousand, four hundred eighty-one".