1778224897 has 2 divisors, whose sum is σ = 1778224898. Its totient is φ = 1778224896.

The previous prime is 1778224867. The next prime is 1778224901. The reversal of 1778224897 is 7984228771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1435197456 + 343027441 = 37884^2 + 18521^2 .

It is an emirp because it is prime and its reverse (7984228771) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1778224897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1778224807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889112448 + 889112449.

It is an arithmetic number, because the mean of its divisors is an integer number (889112449).

Almost surely, 2^1778224897 is an apocalyptic number.

It is an amenable number.

1778224897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1778224897 is an equidigital number, since it uses as much as digits as its factorization.

1778224897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3161088, while the sum is 55.

The square root of 1778224897 is about 42169.0039839691. The cubic root of 1778224897 is about 1211.5152787351.

The spelling of 1778224897 in words is "one billion, seven hundred seventy-eight million, two hundred twenty-four thousand, eight hundred ninety-seven".