1231320043 has 2 divisors, whose sum is σ = 1231320044. Its totient is φ = 1231320042.

The previous prime is 1231320017. The next prime is 1231320067. The reversal of 1231320043 is 3400231321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231320043 - 2⁵ = 1231320011 is a prime.

It is a super-2 number, since 2×1231320043² = 3032298096587043698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1231320043.

It is not a weakly prime, because it can be changed into another prime (1231320443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615660021 + 615660022.

It is an arithmetic number, because the mean of its divisors is an integer number (615660022).

Almost surely, 2^1231320043 is an apocalyptic number.

1231320043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231320043 is an equidigital number, since it uses as much as digits as its factorization.

1231320043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1231320043 is about 35090.1701762759. The cubic root of 1231320043 is about 1071.8244249447.

Adding to 1231320043 its reverse (3400231321), we get a palindrome (4631551364).

The spelling of 1231320043 in words is "one billion, two hundred thirty-one million, three hundred twenty thousand, forty-three".