1243134311 has 4 divisors (see below), whose sum is σ = 1263513624. Its totient is φ = 1222755000.

The previous prime is 1243134253. The next prime is 1243134313. The reversal of 1243134311 is 1134313421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1134313421 = 41 ⋅27666181.

It is a cyclic number.

It is not a de Polignac number, because 1243134311 - 2¹⁸ = 1242872167 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 (1243134313) 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, 10189565 + ... + 10189686.

It is an arithmetic number, because the mean of its divisors is an integer number (315878406).

Almost surely, 2^1243134311 is an apocalyptic number.

1243134311 is a deficient number, since it is larger than the sum of its proper divisors (20379313).

1243134311 is an equidigital number, since it uses as much as digits as its factorization.

1243134311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20379312.

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

The square root of 1243134311 is about 35258.1098614205. The cubic root of 1243134311 is about 1075.2414993035.

Adding to 1243134311 its reverse (1134313421), we get a palindrome (2377447732).

The spelling of 1243134311 in words is "one billion, two hundred forty-three million, one hundred thirty-four thousand, three hundred eleven".