1000581 has 8 divisors (see below), whose sum is σ = 1356960. Its totient is φ = 655632.

The previous prime is 1000579. The next prime is 1000589. The reversal of 1000581 is 1850001.

It is a happy number.

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

It is not a de Polignac number, because 1000581 - 2¹ = 1000579 is a prime.

It is a super-2 number, since 2×1000581² = 2002324675122, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1000581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000589) 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, 2650 + ... + 3003.

It is an arithmetic number, because the mean of its divisors is an integer number (169620).

2^1000581 is an apocalyptic number.

It is an amenable number.

1000581 is a deficient number, since it is larger than the sum of its proper divisors (356379).

1000581 is an equidigital number, since it uses as much as digits as its factorization.

1000581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5715.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1000581 is about 1000.2904578171. The cubic root of 1000581 is about 100.0193629172.

Adding to 1000581 its reverse (1850001), we get a palindrome (2850582).

The spelling of 1000581 in words is "one million, five hundred eighty-one", and thus it is an aban number.