509649623 has 8 divisors (see below), whose sum is σ = 594849792. Its totient is φ = 427547736.

The previous prime is 509649607. The next prime is 509649629. The reversal of 509649623 is 326946905.

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

It is not a de Polignac number, because 509649623 - 2⁴ = 509649607 is a prime.

It is a super-3 number, since 3×509649623³ (a number of 27 digits) contains 333 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 (509649629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774215 + ... + 774872.

It is an arithmetic number, because the mean of its divisors is an integer number (74356224).

Almost surely, 2^509649623 is an apocalyptic number.

509649623 is a deficient number, since it is larger than the sum of its proper divisors (85200169).

509649623 is a wasteful number, since it uses less digits than its factorization.

509649623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549141.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 509649623 is about 22575.4207712725. The cubic root of 509649623 is about 798.7739673272.

The spelling of 509649623 in words is "five hundred nine million, six hundred forty-nine thousand, six hundred twenty-three".