1231168031 has 2 divisors, whose sum is σ = 1231168032. Its totient is φ = 1231168030.

The previous prime is 1231168019. The next prime is 1231168091. The reversal of 1231168031 is 1308611321.

It is a weak prime.

It is an emirp because it is prime and its reverse (1308611321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231168031 is a prime.

It is a super-2 number, since 2×1231168031² = 3031549441112833922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231168091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615584015 + 615584016.

It is an arithmetic number, because the mean of its divisors is an integer number (615584016).

Almost surely, 2^1231168031 is an apocalyptic number.

1231168031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231168031 is an equidigital number, since it uses as much as digits as its factorization.

1231168031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1231168031 is about 35088.0040897170. The cubic root of 1231168031 is about 1071.7803159468.

Adding to 1231168031 its reverse (1308611321), we get a palindrome (2539779352).

The spelling of 1231168031 in words is "one billion, two hundred thirty-one million, one hundred sixty-eight thousand, thirty-one".