1797382661 has 2 divisors, whose sum is σ = 1797382662. Its totient is φ = 1797382660.

The previous prime is 1797382621. The next prime is 1797382673. The reversal of 1797382661 is 1662837971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1419857761 + 377524900 = 37681^2 + 19430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1797382661 - 2¹⁰ = 1797381637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1797382621) 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, 898691330 + 898691331.

It is an arithmetic number, because the mean of its divisors is an integer number (898691331).

Almost surely, 2^1797382661 is an apocalyptic number.

It is an amenable number.

1797382661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1797382661 is an equidigital number, since it uses as much as digits as its factorization.

1797382661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 50.

The square root of 1797382661 is about 42395.5500141229. The cubic root of 1797382661 is about 1215.8505136837.

The spelling of 1797382661 in words is "one billion, seven hundred ninety-seven million, three hundred eighty-two thousand, six hundred sixty-one".