1311562021111 has 2 divisors, whose sum is σ = 1311562021112. Its totient is φ = 1311562021110.

The previous prime is 1311562021109. The next prime is 1311562021129. The reversal of 1311562021111 is 1111202651131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311562021111 - 2¹ = 1311562021109 is a prime.

Together with 1311562021109, 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 (1311562021411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655781010555 + 655781010556.

It is an arithmetic number, because the mean of its divisors is an integer number (655781010556).

Almost surely, 2^{1311562021111} is an apocalyptic number.

1311562021111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311562021111 is an equidigital number, since it uses as much as digits as its factorization.

1311562021111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 25.

Adding to 1311562021111 its reverse (1111202651131), we get a palindrome (2422764672242).

The spelling of 1311562021111 in words is "one trillion, three hundred eleven billion, five hundred sixty-two million, twenty-one thousand, one hundred eleven".