1215122563 has 2 divisors, whose sum is σ = 1215122564. Its totient is φ = 1215122562.

The previous prime is 1215122543. The next prime is 1215122567. The reversal of 1215122563 is 3652215121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1215122563 - 2¹³ = 1215114371 is a prime.

It is a super-2 number, since 2×1215122563² = 2953045686223377938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1215122567) 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, 607561281 + 607561282.

It is an arithmetic number, because the mean of its divisors is an integer number (607561282).

Almost surely, 2^1215122563 is an apocalyptic number.

1215122563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215122563 is an equidigital number, since it uses as much as digits as its factorization.

1215122563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 1215122563 is about 34858.6081621169. The cubic root of 1215122563 is about 1067.1038702652.

Adding to 1215122563 its reverse (3652215121), we get a palindrome (4867337684).

The spelling of 1215122563 in words is "one billion, two hundred fifteen million, one hundred twenty-two thousand, five hundred sixty-three".