545869 has 4 divisors (see below), whose sum is σ = 547420. Its totient is φ = 544320.

The previous prime is 545863. The next prime is 545873. The reversal of 545869 is 968545.

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 191844 + 354025 = 438^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 545869 - 2¹⁵ = 513101 is a prime.

It is a super-2 number, since 2×545869² = 595945930322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545863) 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, 37 + ... + 1045.

It is an arithmetic number, because the mean of its divisors is an integer number (136855).

2⁵⁴⁵⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

545869 is a deficient number, since it is larger than the sum of its proper divisors (1551).

545869 is a wasteful number, since it uses less digits than its factorization.

545869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550.

The product of its digits is 43200, while the sum is 37.

The square root of 545869 is about 738.8294796501. The cubic root of 545869 is about 81.7264830871.

The spelling of 545869 in words is "five hundred forty-five thousand, eight hundred sixty-nine".