1581243496 has 16 divisors (see below), whose sum is σ = 3388379040. Its totient is φ = 677675760.

The previous prime is 1581243487. The next prime is 1581243511. The reversal of 1581243496 is 6943421851.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14118190 + ... + 14118301.

It is an arithmetic number, because the mean of its divisors is an integer number (211773690).

Almost surely, 2^1581243496 is an apocalyptic number.

It is an amenable number.

1581243496 is an abundant number, since it is smaller than the sum of its proper divisors (1807135544).

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

1581243496 is a wasteful number, since it uses less digits than its factorization.

1581243496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28236504 (or 28236500 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 1581243496 is about 39764.8525207878. The cubic root of 1581243496 is about 1165.0187563522.

The spelling of 1581243496 in words is "one billion, five hundred eighty-one million, two hundred forty-three thousand, four hundred ninety-six".