31321113332281 has 2 divisors, whose sum is σ = 31321113332282. Its totient is φ = 31321113332280.

The previous prime is 31321113332233. The next prime is 31321113332309. The reversal of 31321113332281 is 18223331112313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30256380336400 + 1064732995881 = 5500580^2 + 1031859^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321113332281 - 2¹³ = 31321113324089 is a prime.

It is a super-2 number, since 2×31321113332281² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31321113332381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660556666140 + 15660556666141.

It is an arithmetic number, because the mean of its divisors is an integer number (15660556666141).

Almost surely, 2^{31321113332281} is an apocalyptic number.

It is an amenable number.

31321113332281 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321113332281 is an equidigital number, since it uses as much as digits as its factorization.

31321113332281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

Adding to 31321113332281 its reverse (18223331112313), we get a palindrome (49544444444594).

The spelling of 31321113332281 in words is "thirty-one trillion, three hundred twenty-one billion, one hundred thirteen million, three hundred thirty-two thousand, two hundred eighty-one".