1789229681 has 2 divisors, whose sum is σ = 1789229682. Its totient is φ = 1789229680.

The previous prime is 1789229671. The next prime is 1789229737. The reversal of 1789229681 is 1869229871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1690525456 + 98704225 = 41116^2 + 9935^2 .

It is an emirp because it is prime and its reverse (1869229871) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1789229681 is a prime.

It is a super-2 number, since 2×1789229681² = 6402685702742723522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1789229641) 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, 894614840 + 894614841.

It is an arithmetic number, because the mean of its divisors is an integer number (894614841).

Almost surely, 2^1789229681 is an apocalyptic number.

It is an amenable number.

1789229681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1789229681 is an equidigital number, since it uses as much as digits as its factorization.

1789229681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 53.

The square root of 1789229681 is about 42299.2870034472. The cubic root of 1789229681 is about 1214.0093492545.

The spelling of 1789229681 in words is "one billion, seven hundred eighty-nine million, two hundred twenty-nine thousand, six hundred eighty-one".