1780224749 has 2 divisors, whose sum is σ = 1780224750. Its totient is φ = 1780224748.

The previous prime is 1780224739. The next prime is 1780224829. The reversal of 1780224749 is 9474220871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1211736100 + 568488649 = 34810^2 + 23843^2 .

It is an emirp because it is prime and its reverse (9474220871) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1780224749 - 2⁸ = 1780224493 is a prime.

It is a super-2 number, since 2×1780224749² = 6338400313904226002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1780224709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890112374 + 890112375.

It is an arithmetic number, because the mean of its divisors is an integer number (890112375).

Almost surely, 2^1780224749 is an apocalyptic number.

It is an amenable number.

1780224749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1780224749 is an equidigital number, since it uses as much as digits as its factorization.

1780224749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 1780224749 is about 42192.7096664815. The cubic root of 1780224749 is about 1211.9692789669.

The spelling of 1780224749 in words is "one billion, seven hundred eighty million, two hundred twenty-four thousand, seven hundred forty-nine".