31012743161 has 2 divisors, whose sum is σ = 31012743162. Its totient is φ = 31012743160.

The previous prime is 31012743149. The next prime is 31012743317. The reversal of 31012743161 is 16134721013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28101493225 + 2911249936 = 167635^2 + 53956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31012743161 is a prime.

It is not a weakly prime, because it can be changed into another prime (31012743061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506371580 + 15506371581.

It is an arithmetic number, because the mean of its divisors is an integer number (15506371581).

Almost surely, 2^31012743161 is an apocalyptic number.

It is an amenable number.

31012743161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012743161 is an equidigital number, since it uses as much as digits as its factorization.

31012743161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The spelling of 31012743161 in words is "thirty-one billion, twelve million, seven hundred forty-three thousand, one hundred sixty-one".