1242215563 has 2 divisors, whose sum is σ = 1242215564. Its totient is φ = 1242215562.

The previous prime is 1242215561. The next prime is 1242215567. The reversal of 1242215563 is 3655122421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1242215563 - 2¹ = 1242215561 is a prime.

Together with 1242215561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1242215561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621107781 + 621107782.

It is an arithmetic number, because the mean of its divisors is an integer number (621107782).

Almost surely, 2^1242215563 is an apocalyptic number.

1242215563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242215563 is an equidigital number, since it uses as much as digits as its factorization.

1242215563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

The square root of 1242215563 is about 35245.0785642478. The cubic root of 1242215563 is about 1074.9765455131.

Adding to 1242215563 its reverse (3655122421), we get a palindrome (4897337984).

The spelling of 1242215563 in words is "one billion, two hundred forty-two million, two hundred fifteen thousand, five hundred sixty-three".