1243415563 has 16 divisors (see below), whose sum is σ = 1396090080. Its totient is φ = 1099897344.

The previous prime is 1243415561. The next prime is 1243415567. The reversal of 1243415563 is 3655143421.

It is not a de Polignac number, because 1243415563 - 2¹ = 1243415561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243415561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8643 + ... + 50611.

It is an arithmetic number, because the mean of its divisors is an integer number (87255630).

Almost surely, 2^1243415563 is an apocalyptic number.

1243415563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1243415563 is a deficient number, since it is larger than the sum of its proper divisors (152674517).

1243415563 is a wasteful number, since it uses less digits than its factorization.

1243415563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42078.

The product of its digits is 43200, while the sum is 34.

The square root of 1243415563 is about 35262.0981083089. The cubic root of 1243415563 is about 1075.3225822607.

Adding to 1243415563 its reverse (3655143421), we get a palindrome (4898558984).

The spelling of 1243415563 in words is "one billion, two hundred forty-three million, four hundred fifteen thousand, five hundred sixty-three".