545542 has 4 divisors (see below), whose sum is σ = 818316. Its totient is φ = 272770.

The previous prime is 545533. The next prime is 545543. The reversal of 545542 is 245545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245545 = 5 ⋅49109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545543) 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 as a sum of consecutive naturals, namely, 136384 + ... + 136387.

It is an arithmetic number, because the mean of its divisors is an integer number (204579).

2⁵⁴⁵⁵⁴² is an apocalyptic number.

545542 is a deficient number, since it is larger than the sum of its proper divisors (272774).

545542 is a wasteful number, since it uses less digits than its factorization.

545542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272773.

The product of its digits is 4000, while the sum is 25.

The square root of 545542 is about 738.6081505101. The cubic root of 545542 is about 81.7101605517.

The spelling of 545542 in words is "five hundred forty-five thousand, five hundred forty-two".