1081489561 has 4 divisors (see below), whose sum is σ = 1145106612. Its totient is φ = 1017872512.

The previous prime is 1081489543. The next prime is 1081489609. The reversal of 1081489561 is 1659841801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 297769536 + 783720025 = 17256^2 + 27995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081489561 - 2¹⁷ = 1081358489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081489501) 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 in 3 ways as a sum of consecutive naturals, for example, 31808500 + ... + 31808533.

It is an arithmetic number, because the mean of its divisors is an integer number (286276653).

Almost surely, 2^1081489561 is an apocalyptic number.

It is an amenable number.

1081489561 is a deficient number, since it is larger than the sum of its proper divisors (63617051).

1081489561 is an equidigital number, since it uses as much as digits as its factorization.

1081489561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63617050.

The product of its (nonzero) digits is 69120, while the sum is 43.

The square root of 1081489561 is about 32886.0085902805. The cubic root of 1081489561 is about 1026.4570389995.

The spelling of 1081489561 in words is "one billion, eighty-one million, four hundred eighty-nine thousand, five hundred sixty-one".