545091 has 16 divisors (see below), whose sum is σ = 781440. Its totient is φ = 336960.

The previous prime is 545089. The next prime is 545093. The reversal of 545091 is 190545.

It is an interprime number because it is at equal distance from previous prime (545089) and next prime (545093).

It is not a de Polignac number, because 545091 - 2¹ = 545089 is a prime.

545091 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4096 + ... + 4226.

It is an arithmetic number, because the mean of its divisors is an integer number (48840).

2⁵⁴⁵⁰⁹¹ is an apocalyptic number.

545091 is a deficient number, since it is larger than the sum of its proper divisors (236349).

545091 is a wasteful number, since it uses less digits than its factorization.

545091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 545091 is about 738.3027834161. The cubic root of 545091 is about 81.6876377261.

The spelling of 545091 in words is "five hundred forty-five thousand, ninety-one".