1311020111311 has 12 divisors (see below), whose sum is σ = 1329426001512. Its totient is φ = 1292865708096.

The previous prime is 1311020111281. The next prime is 1311020111321. The reversal of 1311020111311 is 1131110201131.

It is not a de Polignac number, because 1311020111311 - 2¹¹ = 1311020109263 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 (1311020111321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45959025 + ... + 45987541.

It is an arithmetic number, because the mean of its divisors is an integer number (110785500126).

Almost surely, 2^{1311020111311} is an apocalyptic number.

1311020111311 is a deficient number, since it is larger than the sum of its proper divisors (18405890201).

1311020111311 is an frugal number, since it uses more digits than its factorization.

1311020111311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37290 (or 37217 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 16.

Adding to 1311020111311 its reverse (1131110201131), we get a palindrome (2442130312442).

The spelling of 1311020111311 in words is "one trillion, three hundred eleven billion, twenty million, one hundred eleven thousand, three hundred eleven".