1231105163 has 4 divisors (see below), whose sum is σ = 1232007120. Its totient is φ = 1230203208.

The previous prime is 1231105103. The next prime is 1231105177. The reversal of 1231105163 is 3615011321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3615011321 = 1429 ⋅2529749.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231105163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231105103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448928 + ... + 451661.

It is an arithmetic number, because the mean of its divisors is an integer number (308001780).

Almost surely, 2^1231105163 is an apocalyptic number.

1231105163 is a deficient number, since it is larger than the sum of its proper divisors (901957).

1231105163 is an equidigital number, since it uses as much as digits as its factorization.

1231105163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901956.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1231105163 is about 35087.1082165516. The cubic root of 1231105163 is about 1071.7620726120.

Adding to 1231105163 its reverse (3615011321), we get a palindrome (4846116484).

The spelling of 1231105163 in words is "one billion, two hundred thirty-one million, one hundred five thousand, one hundred sixty-three".