31024240081 has 2 divisors, whose sum is σ = 31024240082. Its totient is φ = 31024240080.

The previous prime is 31024240067. The next prime is 31024240087. The reversal of 31024240081 is 18004242013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21377071681 + 9647168400 = 146209^2 + 98220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31024240081 is a prime.

It is a super-2 number, since 2×31024240081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31024240087) 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, 15512120040 + 15512120041.

It is an arithmetic number, because the mean of its divisors is an integer number (15512120041).

Almost surely, 2^31024240081 is an apocalyptic number.

It is an amenable number.

31024240081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31024240081 is an equidigital number, since it uses as much as digits as its factorization.

31024240081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 31024240081 its reverse (18004242013), we get a palindrome (49028482094).

The spelling of 31024240081 in words is "thirty-one billion, twenty-four million, two hundred forty thousand, eighty-one".