521675009 has 8 divisors (see below), whose sum is σ = 533509512. Its totient is φ = 509967360.

The previous prime is 521674973. The next prime is 521675017. The reversal of 521675009 is 900576125.

It can be written as a sum of positive squares in 4 ways, for example, as 9409 + 521665600 = 97^2 + 22840^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521675009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 521675009.

It is not an unprimeable number, because it can be changed into a prime (521675069) 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, 23372 + ... + 39869.

It is an arithmetic number, because the mean of its divisors is an integer number (66688689).

Almost surely, 2^521675009 is an apocalyptic number.

It is an amenable number.

521675009 is a deficient number, since it is larger than the sum of its proper divisors (11834503).

521675009 is a wasteful number, since it uses less digits than its factorization.

521675009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63427.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 521675009 is about 22840.2059754285. The cubic root of 521675009 is about 805.0076560104.

The spelling of 521675009 in words is "five hundred twenty-one million, six hundred seventy-five thousand, nine".