1561066 has 8 divisors (see below), whose sum is σ = 2521764. Its totient is φ = 720480.

The previous prime is 1561039. The next prime is 1561069. The reversal of 1561066 is 6601651.

It can be written as a sum of positive squares in 2 ways, for example, as 1510441 + 50625 = 1229^2 + 225^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1561066.

It is not an unprimeable number, because it can be changed into a prime (1561069) 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, 29995 + ... + 30046.

2^1561066 is an apocalyptic number.

1561066 is a deficient number, since it is larger than the sum of its proper divisors (960698).

1561066 is a wasteful number, since it uses less digits than its factorization.

1561066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60056.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1561066 is about 1249.4262683328. The cubic root of 1561066 is about 116.0042111036.

The spelling of 1561066 in words is "one million, five hundred sixty-one thousand, sixty-six".