20031132991 has 2 divisors, whose sum is σ = 20031132992. Its totient is φ = 20031132990.

The previous prime is 20031132977. The next prime is 20031133007. The reversal of 20031132991 is 19923113002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20031132991 - 2⁹ = 20031132479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20031132931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015566495 + 10015566496.

It is an arithmetic number, because the mean of its divisors is an integer number (10015566496).

Almost surely, 2^20031132991 is an apocalyptic number.

20031132991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031132991 is an equidigital number, since it uses as much as digits as its factorization.

20031132991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

Adding to 20031132991 its reverse (19923113002), we get a palindrome (39954245993).

The spelling of 20031132991 in words is "twenty billion, thirty-one million, one hundred thirty-two thousand, nine hundred ninety-one".