2193251745491 has 2 divisors, whose sum is σ = 2193251745492. Its totient is φ = 2193251745490.

The previous prime is 2193251745479. The next prime is 2193251745527. The reversal of 2193251745491 is 1945471523912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2193251745491 - 2³⁸ = 1918373838547 is a prime.

It is not a weakly prime, because it can be changed into another prime (2193257745491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1096625872745 + 1096625872746.

It is an arithmetic number, because the mean of its divisors is an integer number (1096625872746).

Almost surely, 2^{2193251745491} is an apocalyptic number.

2193251745491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2193251745491 is an equidigital number, since it uses as much as digits as its factorization.

2193251745491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 53.

The spelling of 2193251745491 in words is "two trillion, one hundred ninety-three billion, two hundred fifty-one million, seven hundred forty-five thousand, four hundred ninety-one".