31021303997 has 2 divisors, whose sum is σ = 31021303998. Its totient is φ = 31021303996.

The previous prime is 31021303961. The next prime is 31021304057. The reversal of 31021303997 is 79930312013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25429405156 + 5591898841 = 159466^2 + 74779^2 .

It is a cyclic number.

It is not a de Polignac number, because 31021303997 - 2¹² = 31021299901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31021303997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31021303927) 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, 15510651998 + 15510651999.

It is an arithmetic number, because the mean of its divisors is an integer number (15510651999).

Almost surely, 2^31021303997 is an apocalyptic number.

It is an amenable number.

31021303997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31021303997 is an equidigital number, since it uses as much as digits as its factorization.

31021303997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 38.

The spelling of 31021303997 in words is "thirty-one billion, twenty-one million, three hundred three thousand, nine hundred ninety-seven".