509664965 has 8 divisors (see below), whose sum is σ = 611887608. Its totient is φ = 407538880.

The previous prime is 509664959. The next prime is 509664989. The reversal of 509664965 is 569466905.

It can be written as a sum of positive squares in 4 ways, for example, as 80263681 + 429401284 = 8959^2 + 20722^2 .

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

It is not a de Polignac number, because 509664965 - 2⁶ = 509664901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11966 + ... + 34095.

It is an arithmetic number, because the mean of its divisors is an integer number (76485951).

Almost surely, 2^509664965 is an apocalyptic number.

It is an amenable number.

509664965 is a deficient number, since it is larger than the sum of its proper divisors (102222643).

509664965 is a wasteful number, since it uses less digits than its factorization.

509664965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48279.

The product of its (nonzero) digits is 1749600, while the sum is 50.

The square root of 509664965 is about 22575.7605630464. The cubic root of 509664965 is about 798.7819824201.

The spelling of 509664965 in words is "five hundred nine million, six hundred sixty-four thousand, nine hundred sixty-five".