31693310081 has 2 divisors, whose sum is σ = 31693310082. Its totient is φ = 31693310080.

The previous prime is 31693310041. The next prime is 31693310119. The reversal of 31693310081 is 18001339613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30744115600 + 949194481 = 175340^2 + 30809^2 .

It is a cyclic number.

It is not a de Polignac number, because 31693310081 - 2¹⁸ = 31693047937 is a prime.

It is a super-2 number, since 2×31693310081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31693310041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15846655040 + 15846655041.

It is an arithmetic number, because the mean of its divisors is an integer number (15846655041).

Almost surely, 2^31693310081 is an apocalyptic number.

It is an amenable number.

31693310081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31693310081 is an equidigital number, since it uses as much as digits as its factorization.

31693310081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

Adding to 31693310081 its reverse (18001339613), we get a palindrome (49694649694).

The spelling of 31693310081 in words is "thirty-one billion, six hundred ninety-three million, three hundred ten thousand, eighty-one".