545921945 has 4 divisors (see below), whose sum is σ = 655106340. Its totient is φ = 436737552.

The previous prime is 545921921. The next prime is 545921983. The reversal of 545921945 is 549129545.

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

It can be written as a sum of positive squares in 2 ways, for example, as 114404416 + 431517529 = 10696^2 + 20773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545921945 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 545921896 and 545921905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54592190 + ... + 54592199.

It is an arithmetic number, because the mean of its divisors is an integer number (163776585).

Almost surely, 2^545921945 is an apocalyptic number.

It is an amenable number.

545921945 is a deficient number, since it is larger than the sum of its proper divisors (109184395).

545921945 is a wasteful number, since it uses less digits than its factorization.

545921945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109184394.

The product of its digits is 324000, while the sum is 44.

The square root of 545921945 is about 23364.9726085866. The cubic root of 545921945 is about 817.2912527704.

The spelling of 545921945 in words is "five hundred forty-five million, nine hundred twenty-one thousand, nine hundred forty-five".