31232129993 has 2 divisors, whose sum is σ = 31232129994. Its totient is φ = 31232129992.

The previous prime is 31232129987. The next prime is 31232130043. The reversal of 31232129993 is 39992123213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27229290169 + 4002839824 = 165013^2 + 63268^2 .

It is a cyclic number.

It is not a de Polignac number, because 31232129993 - 2⁸ = 31232129737 is a prime.

It is not a weakly prime, because it can be changed into another prime (31232129293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15616064996 + 15616064997.

It is an arithmetic number, because the mean of its divisors is an integer number (15616064997).

Almost surely, 2^31232129993 is an apocalyptic number.

It is an amenable number.

31232129993 is a deficient number, since it is larger than the sum of its proper divisors (1).

31232129993 is an equidigital number, since it uses as much as digits as its factorization.

31232129993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 44.

The spelling of 31232129993 in words is "thirty-one billion, two hundred thirty-two million, one hundred twenty-nine thousand, nine hundred ninety-three".