1563648313 has 2 divisors, whose sum is σ = 1563648314. Its totient is φ = 1563648312.

The previous prime is 1563648293. The next prime is 1563648323. The reversal of 1563648313 is 3138463651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1532879104 + 30769209 = 39152^2 + 5547^2 .

It is an emirp because it is prime and its reverse (3138463651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1563648313 - 2²¹ = 1561551161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1563648323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 781824156 + 781824157.

It is an arithmetic number, because the mean of its divisors is an integer number (781824157).

Almost surely, 2^1563648313 is an apocalyptic number.

It is an amenable number.

1563648313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1563648313 is an equidigital number, since it uses as much as digits as its factorization.

1563648313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 40.

The square root of 1563648313 is about 39542.9932225673. The cubic root of 1563648313 is about 1160.6814052898.

The spelling of 1563648313 in words is "one billion, five hundred sixty-three million, six hundred forty-eight thousand, three hundred thirteen".