1243211313 has 8 divisors (see below), whose sum is σ = 1696164448. Its totient is φ = 809532864.

The previous prime is 1243211239. The next prime is 1243211327. The reversal of 1243211313 is 3131123421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1243211313 - 2²⁰ = 1242162737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243211313.

It is not an unprimeable number, because it can be changed into a prime (1243211393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4818520 + ... + 4818777.

It is an arithmetic number, because the mean of its divisors is an integer number (212020556).

Almost surely, 2^1243211313 is an apocalyptic number.

It is an amenable number.

1243211313 is a deficient number, since it is larger than the sum of its proper divisors (452953135).

1243211313 is an equidigital number, since it uses as much as digits as its factorization.

1243211313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9637343.

The product of its digits is 432, while the sum is 21.

The square root of 1243211313 is about 35259.2018202341. The cubic root of 1243211313 is about 1075.2636996497.

Adding to 1243211313 its reverse (3131123421), we get a palindrome (4374334734).

The spelling of 1243211313 in words is "one billion, two hundred forty-three million, two hundred eleven thousand, three hundred thirteen".