1312111233 has 12 divisors (see below), whose sum is σ = 1941498468. Its totient is φ = 853405440.

The previous prime is 1312111217. The next prime is 1312111249. The reversal of 1312111233 is 3321112131.

It is an interprime number because it is at equal distance from previous prime (1312111217) and next prime (1312111249).

It can be written as a sum of positive squares in 2 ways, for example, as 668119104 + 643992129 = 25848^2 + 25377^2 .

It is not a de Polignac number, because 1312111233 - 2⁴ = 1312111217 is a prime.

It is a super-3 number, since 3×1312111233³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1312111033) 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, 1777560 + ... + 1778297.

It is an arithmetic number, because the mean of its divisors is an integer number (161791539).

Almost surely, 2^1312111233 is an apocalyptic number.

It is an amenable number.

1312111233 is a deficient number, since it is larger than the sum of its proper divisors (629387235).

1312111233 is a wasteful number, since it uses less digits than its factorization.

1312111233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555904 (or 3555901 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1312111233 is about 36223.0759737491. The cubic root of 1312111233 is about 1094.7716719147.

Adding to 1312111233 its reverse (3321112131), we get a palindrome (4633223364).

The spelling of 1312111233 in words is "one billion, three hundred twelve million, one hundred eleven thousand, two hundred thirty-three".