545191 has 4 divisors (see below), whose sum is σ = 549000. Its totient is φ = 541384.

The previous prime is 545189. The next prime is 545203. The reversal of 545191 is 191545.

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

It is a cyclic number.

It is not a de Polignac number, because 545191 - 2¹ = 545189 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 (545131) 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, 1681 + ... + 1978.

It is an arithmetic number, because the mean of its divisors is an integer number (137250).

2⁵⁴⁵¹⁹¹ is an apocalyptic number.

545191 is a deficient number, since it is larger than the sum of its proper divisors (3809).

545191 is a wasteful number, since it uses less digits than its factorization.

545191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3808.

The product of its digits is 900, while the sum is 25.

The square root of 545191 is about 738.3705032028. The cubic root of 545191 is about 81.6926327723.

The spelling of 545191 in words is "five hundred forty-five thousand, one hundred ninety-one".