1231043043 has 4 divisors (see below), whose sum is σ = 1641390728. Its totient is φ = 820695360.

The previous prime is 1231043027. The next prime is 1231043071. The reversal of 1231043043 is 3403401321.

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

It is not a de Polignac number, because 1231043043 - 2⁴ = 1231043027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231043543) 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, 205173838 + ... + 205173843.

It is an arithmetic number, because the mean of its divisors is an integer number (410347682).

Almost surely, 2^1231043043 is an apocalyptic number.

1231043043 is a deficient number, since it is larger than the sum of its proper divisors (410347685).

1231043043 is an equidigital number, since it uses as much as digits as its factorization.

1231043043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410347684.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1231043043 is about 35086.2229799675. Note that the first 3 decimals coincide. The cubic root of 1231043043 is about 1071.7440457253.

Adding to 1231043043 its reverse (3403401321), we get a palindrome (4634444364).

The spelling of 1231043043 in words is "one billion, two hundred thirty-one million, forty-three thousand, forty-three".