1212312263 has 4 divisors (see below), whose sum is σ = 1212424200. Its totient is φ = 1212200328.

The previous prime is 1212312239. The next prime is 1212312307. The reversal of 1212312263 is 3622132121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212312263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212312223) 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 in 3 ways as a sum of consecutive naturals, for example, 37745 + ... + 62042.

It is an arithmetic number, because the mean of its divisors is an integer number (303106050).

Almost surely, 2^1212312263 is an apocalyptic number.

1212312263 is a deficient number, since it is larger than the sum of its proper divisors (111937).

1212312263 is an equidigital number, since it uses as much as digits as its factorization.

1212312263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111936.

The product of its digits is 864, while the sum is 23.

The square root of 1212312263 is about 34818.2748423870. The cubic root of 1212312263 is about 1066.2805796820.

Adding to 1212312263 its reverse (3622132121), we get a palindrome (4834444384).

The spelling of 1212312263 in words is "one billion, two hundred twelve million, three hundred twelve thousand, two hundred sixty-three".