545557 has 4 divisors (see below), whose sum is σ = 547596. Its totient is φ = 543520.

The previous prime is 545551. The next prime is 545579. The reversal of 545557 is 755545.

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 192721 + 352836 = 439^2 + 594^2 .

It is a cyclic number.

It is not a de Polignac number, because 545557 - 2³ = 545549 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 (545551) 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, 544 + ... + 1177.

It is an arithmetic number, because the mean of its divisors is an integer number (136899).

2⁵⁴⁵⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

545557 is a deficient number, since it is larger than the sum of its proper divisors (2039).

545557 is a wasteful number, since it uses less digits than its factorization.

545557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038.

The product of its digits is 17500, while the sum is 31.

The square root of 545557 is about 738.6183046743. The cubic root of 545557 is about 81.7109094346.

The spelling of 545557 in words is "five hundred forty-five thousand, five hundred fifty-seven".