1089681 has 8 divisors (see below), whose sum is σ = 1499904. Its totient is φ = 702960.

The previous prime is 1089679. The next prime is 1089703. The reversal of 1089681 is 1869801.

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

It is not a de Polignac number, because 1089681 - 2¹ = 1089679 is a prime.

It is a super-2 number, since 2×1089681² = 2374809363522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1089611) 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, 5766 + ... + 5951.

It is an arithmetic number, because the mean of its divisors is an integer number (187488).

2^1089681 is an apocalyptic number.

It is an amenable number.

1089681 is a deficient number, since it is larger than the sum of its proper divisors (410223).

1089681 is a wasteful number, since it uses less digits than its factorization.

1089681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11751.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1089681 is about 1043.8778664192. The cubic root of 1089681 is about 102.9042060309.

It can be divided in two parts, 1089 and 681, that added together give a triangular number (1770 = T₅₉).

The spelling of 1089681 in words is "one million, eighty-nine thousand, six hundred eighty-one".