1231104113 has 4 divisors (see below), whose sum is σ = 1303522020. Its totient is φ = 1158686208.

The previous prime is 1231104073. The next prime is 1231104179. The reversal of 1231104113 is 3114011321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 479960464 + 751143649 = 21908^2 + 27407^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231104113 - 2¹⁰ = 1231103089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 72417889 = 1231104113 / (1 + 2 + 3 + 1 + 1 + 0 + 4 + 1 + 1 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231104091 and 1231104100.

It is not an unprimeable number, because it can be changed into a prime (1231104313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36208928 + ... + 36208961.

It is an arithmetic number, because the mean of its divisors is an integer number (325880505).

Almost surely, 2^1231104113 is an apocalyptic number.

It is an amenable number.

1231104113 is a deficient number, since it is larger than the sum of its proper divisors (72417907).

1231104113 is an equidigital number, since it uses as much as digits as its factorization.

1231104113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72417906.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1231104113 is about 35087.0932537878. The cubic root of 1231104113 is about 1071.7617679127.

Adding to 1231104113 its reverse (3114011321), we get a palindrome (4345115434).

The spelling of 1231104113 in words is "one billion, two hundred thirty-one million, one hundred four thousand, one hundred thirteen".