981815543 has 8 divisors (see below), whose sum is σ = 985525200. Its totient is φ = 978113088.

The previous prime is 981815507. The next prime is 981815551. The reversal of 981815543 is 345518189.

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

It is a cyclic number.

It is not a de Polignac number, because 981815543 - 2¹⁸ = 981553399 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 981815494 and 981815503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981815563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495128 + ... + 497106.

It is an arithmetic number, because the mean of its divisors is an integer number (123190650).

Almost surely, 2^981815543 is an apocalyptic number.

981815543 is a deficient number, since it is larger than the sum of its proper divisors (3709657).

981815543 is a wasteful number, since it uses less digits than its factorization.

981815543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601.

The product of its digits is 172800, while the sum is 44.

The square root of 981815543 is about 31333.9359640630. The cubic root of 981815543 is about 993.9013969829.

The spelling of 981815543 in words is "nine hundred eighty-one million, eight hundred fifteen thousand, five hundred forty-three".