1231110313 has 4 divisors (see below), whose sum is σ = 1231182160. Its totient is φ = 1231038468.

The previous prime is 1231110299. The next prime is 1231110371. The reversal of 1231110313 is 3130111321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3130111321 = 33937 ⋅92233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231110313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231110373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6406 + ... + 50032.

It is an arithmetic number, because the mean of its divisors is an integer number (307795540).

Almost surely, 2^1231110313 is an apocalyptic number.

It is an amenable number.

1231110313 is a deficient number, since it is larger than the sum of its proper divisors (71847).

1231110313 is an equidigital number, since it uses as much as digits as its factorization.

1231110313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71846.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1231110313 is about 35087.1816052529. The cubic root of 1231110313 is about 1071.7635670868.

Adding to 1231110313 its reverse (3130111321), we get a palindrome (4361221634).

The spelling of 1231110313 in words is "one billion, two hundred thirty-one million, one hundred ten thousand, three hundred thirteen".