1211343413 has 4 divisors (see below), whose sum is σ = 1384392480. Its totient is φ = 1038294348.

The previous prime is 1211343377. The next prime is 1211343421. The reversal of 1211343413 is 3143431121.

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 not a de Polignac number, because 1211343413 - 2⁶ = 1211343349 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 (1211343443) 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, 86524523 + ... + 86524536.

It is an arithmetic number, because the mean of its divisors is an integer number (346098120).

Almost surely, 2^1211343413 is an apocalyptic number.

It is an amenable number.

1211343413 is a deficient number, since it is larger than the sum of its proper divisors (173049067).

1211343413 is an equidigital number, since it uses as much as digits as its factorization.

1211343413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173049066.

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

The square root of 1211343413 is about 34804.3591091691. The cubic root of 1211343413 is about 1065.9964556177.

Adding to 1211343413 its reverse (3143431121), we get a palindrome (4354774534).

The spelling of 1211343413 in words is "one billion, two hundred eleven million, three hundred forty-three thousand, four hundred thirteen".