243131443031 has 2 divisors, whose sum is σ = 243131443032. Its totient is φ = 243131443030.

The previous prime is 243131442977. The next prime is 243131443067. The reversal of 243131443031 is 130344131342.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243131443031 is a prime.

It is a super-2 number, since 2×243131443031² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243131442985 and 243131443003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243131443091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121565721515 + 121565721516.

It is an arithmetic number, because the mean of its divisors is an integer number (121565721516).

Almost surely, 2^243131443031 is an apocalyptic number.

243131443031 is a deficient number, since it is larger than the sum of its proper divisors (1).

243131443031 is an equidigital number, since it uses as much as digits as its factorization.

243131443031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 243131443031 its reverse (130344131342), we get a palindrome (373475574373).

The spelling of 243131443031 in words is "two hundred forty-three billion, one hundred thirty-one million, four hundred forty-three thousand, thirty-one".