1090581 has 16 divisors (see below), whose sum is σ = 1563840. Its totient is φ = 675792.

The previous prime is 1090577. The next prime is 1090589. The reversal of 1090581 is 1850901.

It is not a de Polignac number, because 1090581 - 2² = 1090577 is a prime.

It is a super-2 number, since 2×1090581² = 2378733835122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

1090581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1090589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20551 + ... + 20603.

It is an arithmetic number, because the mean of its divisors is an integer number (97740).

2^1090581 is an apocalyptic number.

It is an amenable number.

1090581 is a deficient number, since it is larger than the sum of its proper divisors (473259).

1090581 is an frugal number, since it uses more digits than its factorization.

1090581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 1090581 is about 1044.3088623583. The cubic root of 1090581 is about 102.9325287846.

The spelling of 1090581 in words is "one million, ninety thousand, five hundred eighty-one".