545669 has 4 divisors (see below), whose sum is σ = 559020. Its totient is φ = 532320.

The previous prime is 545663. The next prime is 545711. The reversal of 545669 is 966545.

It is a happy number.

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 12769 + 532900 = 113^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 545669 - 2¹⁶ = 480133 is a prime.

It is a super-2 number, since 2×545669² = 595509315122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545663) 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, 6614 + ... + 6695.

It is an arithmetic number, because the mean of its divisors is an integer number (139755).

2⁵⁴⁵⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

545669 is a deficient number, since it is larger than the sum of its proper divisors (13351).

545669 is a wasteful number, since it uses less digits than its factorization.

545669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13350.

The product of its digits is 32400, while the sum is 35.

The square root of 545669 is about 738.6941180218. The cubic root of 545669 is about 81.7165006595.

The spelling of 545669 in words is "five hundred forty-five thousand, six hundred sixty-nine".