1231143433 has 16 divisors (see below), whose sum is σ = 1342129600. Its totient is φ = 1122569280.

The previous prime is 1231143313. The next prime is 1231143443. The reversal of 1231143433 is 3343411321.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231143433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231143398 and 1231143407.

It is not an unprimeable number, because it can be changed into a prime (1231143443) 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 15 ways as a sum of consecutive naturals, for example, 379663 + ... + 382891.

It is an arithmetic number, because the mean of its divisors is an integer number (83883100).

Almost surely, 2^1231143433 is an apocalyptic number.

1231143433 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1231143433 is a deficient number, since it is larger than the sum of its proper divisors (110986167).

1231143433 is a wasteful number, since it uses less digits than its factorization.

1231143433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3592.

The product of its digits is 2592, while the sum is 25.

The square root of 1231143433 is about 35087.6535693112. The cubic root of 1231143433 is about 1071.7731780563.

Adding to 1231143433 its reverse (3343411321), we get a palindrome (4574554754).

The spelling of 1231143433 in words is "one billion, two hundred thirty-one million, one hundred forty-three thousand, four hundred thirty-three".