1243431131 has 2 divisors, whose sum is σ = 1243431132. Its totient is φ = 1243431130.

The previous prime is 1243431113. The next prime is 1243431151. The reversal of 1243431131 is 1311343421.

Together with previous prime (1243431113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1243431131 - 2¹⁴ = 1243414747 is a prime.

It is a super-2 number, since 2×1243431131² = 3092241955079878322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243431097 and 1243431106.

It is not a weakly prime, because it can be changed into another prime (1243431151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621715565 + 621715566.

It is an arithmetic number, because the mean of its divisors is an integer number (621715566).

Almost surely, 2^1243431131 is an apocalyptic number.

1243431131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243431131 is an equidigital number, since it uses as much as digits as its factorization.

1243431131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 1243431131 is about 35262.3188545507. The cubic root of 1243431131 is about 1075.3270700476.

Adding to 1243431131 its reverse (1311343421), we get a palindrome (2554774552).

The spelling of 1243431131 in words is "one billion, two hundred forty-three million, four hundred thirty-one thousand, one hundred thirty-one".