1798693681 has 2 divisors, whose sum is σ = 1798693682. Its totient is φ = 1798693680.

The previous prime is 1798693661. The next prime is 1798693697. The reversal of 1798693681 is 1863968971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1566893056 + 231800625 = 39584^2 + 15225^2 .

It is an emirp because it is prime and its reverse (1863968971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1798693681 - 2¹¹ = 1798691633 is a prime.

It is a super-2 number, since 2×1798693681² = 6470597916138659522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1798693661) 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, 899346840 + 899346841.

It is an arithmetic number, because the mean of its divisors is an integer number (899346841).

Almost surely, 2^1798693681 is an apocalyptic number.

It is an amenable number.

1798693681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798693681 is an equidigital number, since it uses as much as digits as its factorization.

1798693681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 58.

The square root of 1798693681 is about 42411.0089599387. The cubic root of 1798693681 is about 1216.1460576755.

The spelling of 1798693681 in words is "one billion, seven hundred ninety-eight million, six hundred ninety-three thousand, six hundred eighty-one".