1563218401 has 2 divisors, whose sum is σ = 1563218402. Its totient is φ = 1563218400.

The previous prime is 1563218387. The next prime is 1563218413. The reversal of 1563218401 is 1048123651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1538208400 + 25010001 = 39220^2 + 5001^2 .

It is an emirp because it is prime and its reverse (1048123651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1563218401 - 2⁷ = 1563218273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1563218441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 781609200 + 781609201.

It is an arithmetic number, because the mean of its divisors is an integer number (781609201).

Almost surely, 2^1563218401 is an apocalyptic number.

It is an amenable number.

1563218401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1563218401 is an equidigital number, since it uses as much as digits as its factorization.

1563218401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1563218401 is about 39537.5568415652. The cubic root of 1563218401 is about 1160.5750223309.

The spelling of 1563218401 in words is "one billion, five hundred sixty-three million, two hundred eighteen thousand, four hundred one".