1581043 has 8 divisors (see below), whose sum is σ = 1682208. Its totient is φ = 1482624.

The previous prime is 1581037. The next prime is 1581053. The reversal of 1581043 is 3401851.

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

It is a cyclic number.

It is not a de Polignac number, because 1581043 - 2⁵ = 1581011 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571 + ... + 1867.

It is an arithmetic number, because the mean of its divisors is an integer number (210276).

2^1581043 is an apocalyptic number.

1581043 is a deficient number, since it is larger than the sum of its proper divisors (101165).

1581043 is a wasteful number, since it uses less digits than its factorization.

1581043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1581043 is about 1257.3953236751. The cubic root of 1581043 is about 116.4969514205.

Adding to 1581043 its reverse (3401851), we get a palindrome (4982894).

The spelling of 1581043 in words is "one million, five hundred eighty-one thousand, forty-three".