31316463281 has 2 divisors, whose sum is σ = 31316463282. Its totient is φ = 31316463280.

The previous prime is 31316463229. The next prime is 31316463301. The reversal of 31316463281 is 18236461313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29787653281 + 1528810000 = 172591^2 + 39100^2 .

It is a cyclic number.

It is not a de Polignac number, because 31316463281 - 2¹⁴ = 31316446897 is a prime.

It is a super-2 number, since 2×31316463281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31316466281) 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, 15658231640 + 15658231641.

It is an arithmetic number, because the mean of its divisors is an integer number (15658231641).

Almost surely, 2^31316463281 is an apocalyptic number.

It is an amenable number.

31316463281 is a deficient number, since it is larger than the sum of its proper divisors (1).

31316463281 is an equidigital number, since it uses as much as digits as its factorization.

31316463281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The spelling of 31316463281 in words is "thirty-one billion, three hundred sixteen million, four hundred sixty-three thousand, two hundred eighty-one".