7281788250991 has 2 divisors, whose sum is σ = 7281788250992. Its totient is φ = 7281788250990.

The previous prime is 7281788250943. The next prime is 7281788251043. The reversal of 7281788250991 is 1990528871827.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7281788250991 - 2²⁷ = 7281654033263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7281788250941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3640894125495 + 3640894125496.

It is an arithmetic number, because the mean of its divisors is an integer number (3640894125496).

Almost surely, 2^{7281788250991} is an apocalyptic number.

7281788250991 is a deficient number, since it is larger than the sum of its proper divisors (1).

7281788250991 is an equidigital number, since it uses as much as digits as its factorization.

7281788250991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40642560, while the sum is 67.

The spelling of 7281788250991 in words is "seven trillion, two hundred eighty-one billion, seven hundred eighty-eight million, two hundred fifty thousand, nine hundred ninety-one".