1581124042 has 8 divisors (see below), whose sum is σ = 2374116516. Its totient is φ = 789751872.

The previous prime is 1581124003. The next prime is 1581124043. The reversal of 1581124042 is 2404211851.

It can be written as a sum of positive squares in 2 ways, for example, as 1456109281 + 125014761 = 38159^2 + 11181^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1581124042.

It is not an unprimeable number, because it can be changed into a prime (1581124043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402633 + ... + 406540.

Almost surely, 2^1581124042 is an apocalyptic number.

1581124042 is a deficient number, since it is larger than the sum of its proper divisors (792992474).

1581124042 is an equidigital number, since it uses as much as digits as its factorization.

1581124042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810152.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 1581124042 is about 39763.3504876035. The cubic root of 1581124042 is about 1164.9894187549.

Adding to 1581124042 its reverse (2404211851), we get a palindrome (3985335893).

The spelling of 1581124042 in words is "one billion, five hundred eighty-one million, one hundred twenty-four thousand, forty-two".