1581117988543 has 4 divisors (see below), whose sum is σ = 1583406148408. Its totient is φ = 1578829828680.

The previous prime is 1581117988529. The next prime is 1581117988559. The reversal of 1581117988543 is 3458897111851.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1581117988543 - 2²⁹ = 1580581117631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581117988243) 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, 1144078896 + ... + 1144080277.

It is an arithmetic number, because the mean of its divisors is an integer number (395851537102).

Almost surely, 2^{1581117988543} is an apocalyptic number.

1581117988543 is a deficient number, since it is larger than the sum of its proper divisors (2288159865).

1581117988543 is an equidigital number, since it uses as much as digits as its factorization.

1581117988543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288159864.

The product of its digits is 9676800, while the sum is 61.

The spelling of 1581117988543 in words is "one trillion, five hundred eighty-one billion, one hundred seventeen million, nine hundred eighty-eight thousand, five hundred forty-three".