1089581 has 8 divisors (see below), whose sum is σ = 1166400. Its totient is φ = 1014208.

The previous prime is 1089563. The next prime is 1089611. The reversal of 1089581 is 1859801.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089581 is a prime.

It is a super-2 number, since 2×1089581² = 2374373511122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089551) 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 7 ways as a sum of consecutive naturals, for example, 1520 + ... + 2118.

It is an arithmetic number, because the mean of its divisors is an integer number (145800).

2^1089581 is an apocalyptic number.

It is an amenable number.

1089581 is a deficient number, since it is larger than the sum of its proper divisors (76819).

1089581 is a wasteful number, since it uses less digits than its factorization.

1089581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 1089581 is about 1043.8299669965. The cubic root of 1089581 is about 102.9010580957.

The spelling of 1089581 in words is "one million, eighty-nine thousand, five hundred eighty-one".