1312100243 has 2 divisors, whose sum is σ = 1312100244. Its totient is φ = 1312100242.

The previous prime is 1312100227. The next prime is 1312100261. The reversal of 1312100243 is 3420012131.

It is a weak prime.

It is an emirp because it is prime and its reverse (3420012131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312100243 - 2⁴ = 1312100227 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312160243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656050121 + 656050122.

It is an arithmetic number, because the mean of its divisors is an integer number (656050122).

Almost surely, 2^1312100243 is an apocalyptic number.

1312100243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312100243 is an equidigital number, since it uses as much as digits as its factorization.

1312100243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1312100243 is about 36222.9242745530. The cubic root of 1312100243 is about 1094.7686153715.

Adding to 1312100243 its reverse (3420012131), we get a palindrome (4732112374).

The spelling of 1312100243 in words is "one billion, three hundred twelve million, one hundred thousand, two hundred forty-three".