545251 has 4 divisors (see below), whose sum is σ = 623152. Its totient is φ = 467352.

The previous prime is 545239. The next prime is 545257. The reversal of 545251 is 152545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152545 = 5 ⋅30509.

It is a cyclic number.

It is not a de Polignac number, because 545251 - 2¹¹ = 543203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (545257) 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, 38940 + ... + 38953.

It is an arithmetic number, because the mean of its divisors is an integer number (155788).

2⁵⁴⁵²⁵¹ is an apocalyptic number.

545251 is a deficient number, since it is larger than the sum of its proper divisors (77901).

545251 is an equidigital number, since it uses as much as digits as its factorization.

545251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77900.

The product of its digits is 1000, while the sum is 22.

The square root of 545251 is about 738.4111320938. The cubic root of 545251 is about 81.6956295069.

Adding to 545251 its reverse (152545), we get a palindrome (697796).

The spelling of 545251 in words is "five hundred forty-five thousand, two hundred fifty-one".