15980543 has 4 divisors (see below), whose sum is σ = 15988560. Its totient is φ = 15972528.

The previous prime is 15980521. The next prime is 15980551. The reversal of 15980543 is 34508951.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34508951 = 47 ⋅734233.

It is a cyclic number.

It is not a de Polignac number, because 15980543 - 2¹⁴ = 15964159 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 (15980243) 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, 1571 + ... + 5867.

It is an arithmetic number, because the mean of its divisors is an integer number (3997140).

Almost surely, 2^15980543 is an apocalyptic number.

15980543 is a deficient number, since it is larger than the sum of its proper divisors (8017).

15980543 is an equidigital number, since it uses as much as digits as its factorization.

15980543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8016.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 15980543 is about 3997.5671351461. The cubic root of 15980543 is about 251.8820256975.

The spelling of 15980543 in words is "fifteen million, nine hundred eighty thousand, five hundred forty-three".