1312311111 has 32 divisors (see below), whose sum is σ = 1848572928. Its totient is φ = 827249280.

The previous prime is 1312311101. The next prime is 1312311137. The reversal of 1312311111 is 1111132131.

It is not a de Polignac number, because 1312311111 - 2⁶ = 1312311047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312311101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 499381 + ... + 502001.

It is an arithmetic number, because the mean of its divisors is an integer number (57767904).

Almost surely, 2^1312311111 is an apocalyptic number.

1312311111 is a deficient number, since it is larger than the sum of its proper divisors (536261817).

1312311111 is a wasteful number, since it uses less digits than its factorization.

1312311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791.

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

The square root of 1312311111 is about 36225.8348558042. The cubic root of 1312311111 is about 1094.8272590876.

Adding to 1312311111 its reverse (1111132131), we get a palindrome (2423443242).

The spelling of 1312311111 in words is "one billion, three hundred twelve million, three hundred eleven thousand, one hundred eleven".