1543559961 has 16 divisors (see below), whose sum is σ = 2087849024. Its totient is φ = 1014177024.

The previous prime is 1543559917. The next prime is 1543560013. The reversal of 1543559961 is 1699553451.

It is not a de Polignac number, because 1543559961 - 2²³ = 1535171353 is a prime.

It is a Duffinian number.

Its product of digits (729000) is a multiple of the sum of its prime divisors (5400).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1543559961.

It is not an unprimeable number, because it can be changed into a prime (1543559911) 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 15 ways as a sum of consecutive naturals, for example, 538845 + ... + 541701.

It is an arithmetic number, because the mean of its divisors is an integer number (130490564).

Almost surely, 2^1543559961 is an apocalyptic number.

It is an amenable number.

1543559961 is a deficient number, since it is larger than the sum of its proper divisors (544289063).

1543559961 is a wasteful number, since it uses less digits than its factorization.

1543559961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5400.

The product of its digits is 729000, while the sum is 48.

The square root of 1543559961 is about 39288.1656609214. The cubic root of 1543559961 is about 1155.6895019125.

The spelling of 1543559961 in words is "one billion, five hundred forty-three million, five hundred fifty-nine thousand, nine hundred sixty-one".