1581142 has 8 divisors (see below), whose sum is σ = 2496600. Its totient is φ = 748944.

The previous prime is 1581131. The next prime is 1581157. The reversal of 1581142 is 2411851.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20767 + ... + 20842.

It is an arithmetic number, because the mean of its divisors is an integer number (312075).

2^1581142 is an apocalyptic number.

1581142 is a deficient number, since it is larger than the sum of its proper divisors (915458).

1581142 is a wasteful number, since it uses less digits than its factorization.

1581142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41630.

The product of its digits is 320, while the sum is 22.

The square root of 1581142 is about 1257.4346901529. The cubic root of 1581142 is about 116.4993829288.

Adding to 1581142 its reverse (2411851), we get a palindrome (3992993).

The spelling of 1581142 in words is "one million, five hundred eighty-one thousand, one hundred forty-two".