1797526561 has 2 divisors, whose sum is σ = 1797526562. Its totient is φ = 1797526560.

The previous prime is 1797526553. The next prime is 1797526573. The reversal of 1797526561 is 1656257971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1048464400 + 749062161 = 32380^2 + 27369^2 .

It is a cyclic number.

It is not a de Polignac number, because 1797526561 - 2³ = 1797526553 is a prime.

It is a super-2 number, since 2×1797526561² = 6462203475000973442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1797526531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 898763280 + 898763281.

It is an arithmetic number, because the mean of its divisors is an integer number (898763281).

Almost surely, 2^1797526561 is an apocalyptic number.

It is an amenable number.

1797526561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1797526561 is an equidigital number, since it uses as much as digits as its factorization.

1797526561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 793800, while the sum is 49.

The square root of 1797526561 is about 42397.2470922347. The cubic root of 1797526561 is about 1215.8829601634.

The spelling of 1797526561 in words is "one billion, seven hundred ninety-seven million, five hundred twenty-six thousand, five hundred sixty-one".