1231105433 has 4 divisors (see below), whose sum is σ = 1231872180. Its totient is φ = 1230338688.

The previous prime is 1231105397. The next prime is 1231105481. The reversal of 1231105433 is 3345011321.

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 954315664 + 276789769 = 30892^2 + 16637^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231105433 - 2⁸ = 1231105177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231105399 and 1231105408.

It is not an unprimeable number, because it can be changed into a prime (1231105333) 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, 380960 + ... + 384177.

It is an arithmetic number, because the mean of its divisors is an integer number (307968045).

Almost surely, 2^1231105433 is an apocalyptic number.

It is an amenable number.

1231105433 is a deficient number, since it is larger than the sum of its proper divisors (766747).

1231105433 is an equidigital number, since it uses as much as digits as its factorization.

1231105433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766746.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1231105433 is about 35087.1120641184. The cubic root of 1231105433 is about 1071.7621509632.

Adding to 1231105433 its reverse (3345011321), we get a palindrome (4576116754).

The spelling of 1231105433 in words is "one billion, two hundred thirty-one million, one hundred five thousand, four hundred thirty-three".