1213312447 has 4 divisors (see below), whose sum is σ = 1231421656. Its totient is φ = 1195203240.

The previous prime is 1213312433. The next prime is 1213312453. The reversal of 1213312447 is 7442133121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213312447 - 2¹⁵ = 1213279679 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 (1213312427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9054504 + ... + 9054637.

It is an arithmetic number, because the mean of its divisors is an integer number (307855414).

Almost surely, 2^1213312447 is an apocalyptic number.

1213312447 is a deficient number, since it is larger than the sum of its proper divisors (18109209).

1213312447 is an equidigital number, since it uses as much as digits as its factorization.

1213312447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18109208.

The product of its digits is 4032, while the sum is 28.

The square root of 1213312447 is about 34832.6347984186. The cubic root of 1213312447 is about 1066.5737339717.

Adding to 1213312447 its reverse (7442133121), we get a palindrome (8655445568).

The spelling of 1213312447 in words is "one billion, two hundred thirteen million, three hundred twelve thousand, four hundred forty-seven".