1231235433 has 6 divisors (see below), whose sum is σ = 1778451194. Its totient is φ = 820823616.

The previous prime is 1231235417. The next prime is 1231235437. The reversal of 1231235433 is 3345321321.

It can be written as a sum of positive squares in only one way, i.e., 940771584 + 290463849 = 30672^2 + 17043^2 .

It is not a de Polignac number, because 1231235433 - 2⁴ = 1231235417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1231235397 and 1231235406.

It is not an unprimeable number, because it can be changed into a prime (1231235437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68401960 + ... + 68401977.

Almost surely, 2^1231235433 is an apocalyptic number.

It is an amenable number.

1231235433 is a deficient number, since it is larger than the sum of its proper divisors (547215761).

1231235433 is a wasteful number, since it uses less digits than its factorization.

1231235433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136803943 (or 136803940 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 1231235433 is about 35088.9645472761. The cubic root of 1231235433 is about 1071.7998742894.

Adding to 1231235433 its reverse (3345321321), we get a palindrome (4576556754).

The spelling of 1231235433 in words is "one billion, two hundred thirty-one million, two hundred thirty-five thousand, four hundred thirty-three".