1312111311 has 16 divisors (see below), whose sum is σ = 2027570688. Its totient is φ = 739216800.

The previous prime is 1312111309. The next prime is 1312111319. The reversal of 1312111311 is 1131112131.

It is not a de Polignac number, because 1312111311 - 2¹ = 1312111309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312111319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438520 + ... + 441501.

It is an arithmetic number, because the mean of its divisors is an integer number (126723168).

Almost surely, 2^1312111311 is an apocalyptic number.

1312111311 is a deficient number, since it is larger than the sum of its proper divisors (715459377).

1312111311 is an equidigital number, since it uses as much as digits as its factorization.

1312111311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880102.

The product of its digits is 18, while the sum is 15.

The square root of 1312111311 is about 36223.0770504108. The cubic root of 1312111311 is about 1094.7716936081.

Adding to 1312111311 its reverse (1131112131), we get a palindrome (2443223442).

The spelling of 1312111311 in words is "one billion, three hundred twelve million, one hundred eleven thousand, three hundred eleven".