31312043123 has 2 divisors, whose sum is σ = 31312043124. Its totient is φ = 31312043122.

The previous prime is 31312043099. The next prime is 31312043131. The reversal of 31312043123 is 32134021313.

It is a strong prime.

It is an emirp because it is prime and its reverse (32134021313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31312043123 - 2¹² = 31312039027 is a prime.

It is a super-2 number, since 2×31312043123² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31312043143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656021561 + 15656021562.

It is an arithmetic number, because the mean of its divisors is an integer number (15656021562).

Almost surely, 2^31312043123 is an apocalyptic number.

31312043123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312043123 is an equidigital number, since it uses as much as digits as its factorization.

31312043123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31312043123 its reverse (32134021313), we get a palindrome (63446064436).

The spelling of 31312043123 in words is "thirty-one billion, three hundred twelve million, forty-three thousand, one hundred twenty-three".