1581056 has 28 divisors (see below), whose sum is σ = 3178302. Its totient is φ = 786432.

The previous prime is 1581053. The next prime is 1581061. The reversal of 1581056 is 6501851.

It can be written as a sum of positive squares in only one way, i.e., 1478656 + 102400 = 1216^2 + 320^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8096 + ... + 8288.

2^1581056 is an apocalyptic number.

1581056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1581056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1589151).

1581056 is an abundant number, since it is smaller than the sum of its proper divisors (1597246).

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

1581056 is an frugal number, since it uses more digits than its factorization.

1581056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1581056 is about 1257.4004930809. The cubic root of 1581056 is about 116.4972707153.

The spelling of 1581056 in words is "one million, five hundred eighty-one thousand, fifty-six".