1215630563 has 6 divisors (see below), whose sum is σ = 1414100916. Its totient is φ = 1041969012.

The previous prime is 1215630557. The next prime is 1215630587. The reversal of 1215630563 is 3650365121.

It is not a de Polignac number, because 1215630563 - 2¹⁶ = 1215565027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215630593) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12404345 + ... + 12404442.

It is an arithmetic number, because the mean of its divisors is an integer number (235683486).

Almost surely, 2^1215630563 is an apocalyptic number.

1215630563 is a deficient number, since it is larger than the sum of its proper divisors (198470353).

1215630563 is an equidigital number, since it uses as much as digits as its factorization.

1215630563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24808801 (or 24808794 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 1215630563 is about 34865.8939796472. The cubic root of 1215630563 is about 1067.2525557442.

Adding to 1215630563 its reverse (3650365121), we get a palindrome (4865995684).

The spelling of 1215630563 in words is "one billion, two hundred fifteen million, six hundred thirty thousand, five hundred sixty-three".