1311100243 has 2 divisors, whose sum is σ = 1311100244. Its totient is φ = 1311100242.

The previous prime is 1311100223. The next prime is 1311100247. The reversal of 1311100243 is 3420011131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311100243 - 2¹³ = 1311092051 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311100247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655550121 + 655550122.

It is an arithmetic number, because the mean of its divisors is an integer number (655550122).

Almost surely, 2^1311100243 is an apocalyptic number.

1311100243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311100243 is an equidigital number, since it uses as much as digits as its factorization.

1311100243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1311100243 is about 36209.1182300812. The cubic root of 1311100243 is about 1094.4904235031.

Adding to 1311100243 its reverse (3420011131), we get a palindrome (4731111374).

The spelling of 1311100243 in words is "one billion, three hundred eleven million, one hundred thousand, two hundred forty-three".