509090 has 8 divisors (see below), whose sum is σ = 916380. Its totient is φ = 203632.

The previous prime is 509087. The next prime is 509101. The reversal of 509090 is 90905.

509090 = T₂₅₃ + T₂₅₄ + ... + T₂₆₇.

It can be written as a sum of positive squares in 2 ways, for example, as 491401 + 17689 = 701^2 + 133^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

509090 is a modest number, since divided by 9090 gives 50 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25445 + ... + 25464.

2⁵⁰⁹⁰⁹⁰ is an apocalyptic number.

509090 is a deficient number, since it is larger than the sum of its proper divisors (407290).

509090 is a wasteful number, since it uses less digits than its factorization.

509090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50916.

The product of its (nonzero) digits is 405, while the sum is 23.

The square root of 509090 is about 713.5054309534. The cubic root of 509090 is about 79.8481494500.

Adding to 509090 its reverse (90905), we get a palindrome (599995).

The spelling of 509090 in words is "five hundred nine thousand, ninety".