1005561 has 8 divisors (see below), whose sum is σ = 1489760. Its totient is φ = 670356.

The previous prime is 1005553. The next prime is 1005581. The reversal of 1005561 is 1655001.

1005561 is a `hidden beast` number, since 100 + 5 + 561 = 666.

It is not a de Polignac number, because 1005561 - 2³ = 1005553 is a prime.

It is a super-2 number, since 2×1005561² = 2022305849442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1005541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18595 + ... + 18648.

It is an arithmetic number, because the mean of its divisors is an integer number (186220).

2^1005561 is an apocalyptic number.

It is an amenable number.

1005561 is a deficient number, since it is larger than the sum of its proper divisors (484199).

1005561 is an equidigital number, since it uses as much as digits as its factorization.

1005561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37252 (or 37246 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 1005561 is about 1002.7766451209. The cubic root of 1005561 is about 100.1850241163.

The spelling of 1005561 in words is "one million, five thousand, five hundred sixty-one".