1321080543 has 16 divisors (see below), whose sum is σ = 1972572160. Its totient is φ = 873783288.

The previous prime is 1321080511. The next prime is 1321080547. The reversal of 1321080543 is 3450801231.

It is a happy number.

1321080543 is a `hidden beast` number, since 1 + 32 + 10 + 80 + 543 = 666.

It is not a de Polignac number, because 1321080543 - 2⁵ = 1321080511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321080547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189205 + ... + 196062.

It is an arithmetic number, because the mean of its divisors is an integer number (123285760).

Almost surely, 2^1321080543 is an apocalyptic number.

1321080543 is a deficient number, since it is larger than the sum of its proper divisors (651491617).

1321080543 is a wasteful number, since it uses less digits than its factorization.

1321080543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385403 (or 385397 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1321080543 is about 36346.6716908165. The cubic root of 1321080543 is about 1097.2605505326.

Adding to 1321080543 its reverse (3450801231), we get a palindrome (4771881774).

The spelling of 1321080543 in words is "one billion, three hundred twenty-one million, eighty thousand, five hundred forty-three".