921545543 has 4 divisors (see below), whose sum is σ = 970047960. Its totient is φ = 873043128.

The previous prime is 921545533. The next prime is 921545549. The reversal of 921545543 is 345545129.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921545543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 921545497 and 921545506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921545549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24251180 + ... + 24251217.

It is an arithmetic number, because the mean of its divisors is an integer number (242511990).

Almost surely, 2^921545543 is an apocalyptic number.

921545543 is a deficient number, since it is larger than the sum of its proper divisors (48502417).

921545543 is a wasteful number, since it uses less digits than its factorization.

921545543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48502416.

The product of its digits is 108000, while the sum is 38.

The square root of 921545543 is about 30356.9686068949. The cubic root of 921545543 is about 973.1331511784.

The spelling of 921545543 in words is "nine hundred twenty-one million, five hundred forty-five thousand, five hundred forty-three".