1720225847 has 2 divisors, whose sum is σ = 1720225848. Its totient is φ = 1720225846.

The previous prime is 1720225831. The next prime is 1720225873. The reversal of 1720225847 is 7485220271.

It is a weak prime.

It is an emirp because it is prime and its reverse (7485220271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1720225847 - 2⁴ = 1720225831 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1720225847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720225877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860112923 + 860112924.

It is an arithmetic number, because the mean of its divisors is an integer number (860112924).

Almost surely, 2^1720225847 is an apocalyptic number.

1720225847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720225847 is an equidigital number, since it uses as much as digits as its factorization.

1720225847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62720, while the sum is 38.

The square root of 1720225847 is about 41475.6054446466. The cubic root of 1720225847 is about 1198.1977220633.

The spelling of 1720225847 in words is "one billion, seven hundred twenty million, two hundred twenty-five thousand, eight hundred forty-seven".