1081566 has 16 divisors (see below), whose sum is σ = 2403600. Its totient is φ = 360504.

The previous prime is 1081541. The next prime is 1081583. The reversal of 1081566 is 6651801.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9961 + ... + 10068.

It is an arithmetic number, because the mean of its divisors is an integer number (150225).

2^1081566 is an apocalyptic number.

1081566 is an abundant number, since it is smaller than the sum of its proper divisors (1322034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1081566 is a wasteful number, since it uses less digits than its factorization.

1081566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20040 (or 20034 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1081566 is about 1039.9836537177. The cubic root of 1081566 is about 102.6481221542.

The spelling of 1081566 in words is "one million, eighty-one thousand, five hundred sixty-six".