31332231201991 has 2 divisors, whose sum is σ = 31332231201992. Its totient is φ = 31332231201990.

The previous prime is 31332231201977. The next prime is 31332231202043. The reversal of 31332231201991 is 19910213223313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31332231201991 - 2³⁵ = 31297871463623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31332231208991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15666115600995 + 15666115600996.

It is an arithmetic number, because the mean of its divisors is an integer number (15666115600996).

Almost surely, 2^{31332231201991} is an apocalyptic number.

31332231201991 is a deficient number, since it is larger than the sum of its proper divisors (1).

31332231201991 is an equidigital number, since it uses as much as digits as its factorization.

31332231201991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 40.

The spelling of 31332231201991 in words is "thirty-one trillion, three hundred thirty-two billion, two hundred thirty-one million, two hundred one thousand, nine hundred ninety-one".