1212443313 has 4 divisors (see below), whose sum is σ = 1616591088. Its totient is φ = 808295540.

The previous prime is 1212443311. The next prime is 1212443327. The reversal of 1212443313 is 3133442121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1212443313 - 2¹ = 1212443311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212443311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202073883 + ... + 202073888.

It is an arithmetic number, because the mean of its divisors is an integer number (404147772).

Almost surely, 2^1212443313 is an apocalyptic number.

It is an amenable number.

1212443313 is a deficient number, since it is larger than the sum of its proper divisors (404147775).

1212443313 is an equidigital number, since it uses as much as digits as its factorization.

1212443313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404147774.

The product of its digits is 1728, while the sum is 24.

The square root of 1212443313 is about 34820.1567055635. The cubic root of 1212443313 is about 1066.3189996611.

Adding to 1212443313 its reverse (3133442121), we get a palindrome (4345885434).

The spelling of 1212443313 in words is "one billion, two hundred twelve million, four hundred forty-three thousand, three hundred thirteen".