31122310081 has 2 divisors, whose sum is σ = 31122310082. Its totient is φ = 31122310080.

The previous prime is 31122310073. The next prime is 31122310133. The reversal of 31122310081 is 18001322113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28183694400 + 2938615681 = 167880^2 + 54209^2 .

It is an emirp because it is prime and its reverse (18001322113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31122310081 - 2³ = 31122310073 is a prime.

It is a super-2 number, since 2×31122310081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31122310181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561155040 + 15561155041.

It is an arithmetic number, because the mean of its divisors is an integer number (15561155041).

Almost surely, 2^31122310081 is an apocalyptic number.

It is an amenable number.

31122310081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31122310081 is an equidigital number, since it uses as much as digits as its factorization.

31122310081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 31122310081 its reverse (18001322113), we get a palindrome (49123632194).

The spelling of 31122310081 in words is "thirty-one billion, one hundred twenty-two million, three hundred ten thousand, eighty-one".