20312323240991 has 2 divisors, whose sum is σ = 20312323240992. Its totient is φ = 20312323240990.

The previous prime is 20312323240987. The next prime is 20312323241009. The reversal of 20312323240991 is 19904232321302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20312323240991 - 2² = 20312323240987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312323240931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156161620495 + 10156161620496.

It is an arithmetic number, because the mean of its divisors is an integer number (10156161620496).

Almost surely, 2^{20312323240991} is an apocalyptic number.

20312323240991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312323240991 is an equidigital number, since it uses as much as digits as its factorization.

20312323240991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 20312323240991 in words is "twenty trillion, three hundred twelve billion, three hundred twenty-three million, two hundred forty thousand, nine hundred ninety-one".