31203313081 has 2 divisors, whose sum is σ = 31203313082. Its totient is φ = 31203313080.

The previous prime is 31203313079. The next prime is 31203313117. The reversal of 31203313081 is 18031330213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30464560681 + 738752400 = 174541^2 + 27180^2 .

It is a cyclic number.

It is not a de Polignac number, because 31203313081 - 2¹ = 31203313079 is a prime.

It is a super-2 number, since 2×31203313081² (a number of 22 digits) contains 22 as substring.

Together with 31203313079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31203313181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15601656540 + 15601656541.

It is an arithmetic number, because the mean of its divisors is an integer number (15601656541).

Almost surely, 2^31203313081 is an apocalyptic number.

It is an amenable number.

31203313081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31203313081 is an equidigital number, since it uses as much as digits as its factorization.

31203313081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31203313081 its reverse (18031330213), we get a palindrome (49234643294).

The spelling of 31203313081 in words is "thirty-one billion, two hundred three million, three hundred thirteen thousand, eighty-one".