509546 has 4 divisors (see below), whose sum is σ = 764322. Its totient is φ = 254772.

The previous prime is 509543. The next prime is 509549. The reversal of 509546 is 645905.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (509543) and next prime (509549).

It can be written as a sum of positive squares in only one way, i.e., 297025 + 212521 = 545^2 + 461^2 .

It is a super-2 number, since 2×509546² = 519274252232, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 509546 parts by 1009 straight cuts.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (509543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127385 + ... + 127388.

2⁵⁰⁹⁵⁴⁶ is an apocalyptic number.

509546 is a deficient number, since it is larger than the sum of its proper divisors (254776).

509546 is a wasteful number, since it uses less digits than its factorization.

509546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254775.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 509546 is about 713.8249085035. The cubic root of 509546 is about 79.8719827541.

The spelling of 509546 in words is "five hundred nine thousand, five hundred forty-six".