31320002281 has 2 divisors, whose sum is σ = 31320002282. Its totient is φ = 31320002280.

The previous prime is 31320002227. The next prime is 31320002293. The reversal of 31320002281 is 18220002313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29681776656 + 1638225625 = 172284^2 + 40475^2 .

It is an emirp because it is prime and its reverse (18220002313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31320002281 - 2¹⁹ = 31319477993 is a prime.

It is a super-2 number, since 2×31320002281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31320092281) 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, 15660001140 + 15660001141.

It is an arithmetic number, because the mean of its divisors is an integer number (15660001141).

Almost surely, 2^31320002281 is an apocalyptic number.

It is an amenable number.

31320002281 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320002281 is an equidigital number, since it uses as much as digits as its factorization.

31320002281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 31320002281 its reverse (18220002313), we get a palindrome (49540004594).

The spelling of 31320002281 in words is "thirty-one billion, three hundred twenty million, two thousand, two hundred eighty-one".