1811310431893 has 2 divisors, whose sum is σ = 1811310431894. Its totient is φ = 1811310431892.

The previous prime is 1811310431891. The next prime is 1811310431911. The reversal of 1811310431893 is 3981340131181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1777616892529 + 33693539364 = 1333273^2 + 183558^2 .

It is a cyclic number.

It is not a de Polignac number, because 1811310431893 - 2¹ = 1811310431891 is a prime.

Together with 1811310431891, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1811310431891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905655215946 + 905655215947.

It is an arithmetic number, because the mean of its divisors is an integer number (905655215947).

Almost surely, 2^{1811310431893} is an apocalyptic number.

It is an amenable number.

1811310431893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811310431893 is an equidigital number, since it uses as much as digits as its factorization.

1811310431893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 1811310431893 in words is "one trillion, eight hundred eleven billion, three hundred ten million, four hundred thirty-one thousand, eight hundred ninety-three".