1089680561 has 2 divisors, whose sum is σ = 1089680562. Its totient is φ = 1089680560.

The previous prime is 1089680507. The next prime is 1089680611. The reversal of 1089680561 is 1650869801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 730350625 + 359329936 = 27025^2 + 18956^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089680561 - 2²² = 1085486257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1089685561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544840280 + 544840281.

It is an arithmetic number, because the mean of its divisors is an integer number (544840281).

Almost surely, 2^1089680561 is an apocalyptic number.

It is an amenable number.

1089680561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089680561 is an equidigital number, since it uses as much as digits as its factorization.

1089680561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 1089680561 is about 33010.3099197811. The cubic root of 1089680561 is about 1029.0419221188.

The spelling of 1089680561 in words is "one billion, eighty-nine million, six hundred eighty thousand, five hundred sixty-one".