1248206319991 has 2 divisors, whose sum is σ = 1248206319992. Its totient is φ = 1248206319990.

The previous prime is 1248206319959. The next prime is 1248206320001. The reversal of 1248206319991 is 1999136028421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1248206319991 - 2⁵ = 1248206319959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1248206319391) 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, 624103159995 + 624103159996.

It is an arithmetic number, because the mean of its divisors is an integer number (624103159996).

Almost surely, 2^{1248206319991} is an apocalyptic number.

1248206319991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1248206319991 is an equidigital number, since it uses as much as digits as its factorization.

1248206319991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 1248206319991 in words is "one trillion, two hundred forty-eight billion, two hundred six million, three hundred nineteen thousand, nine hundred ninety-one".