521340624009 has 24 divisors (see below), whose sum is σ = 792717635840. Its totient is φ = 329252815008.

The previous prime is 521340624001. The next prime is 521340624011. The reversal of 521340624009 is 900426043125.

It is a happy number.

521340624009 is a `hidden beast` number, since 5 + 2 + 1 + 3 + 406 + 240 + 0 + 9 = 666.

It is not a de Polignac number, because 521340624009 - 2³ = 521340624001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521340624001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4644819 + ... + 4755735.

Almost surely, 2^521340624009 is an apocalyptic number.

It is an amenable number.

521340624009 is a deficient number, since it is larger than the sum of its proper divisors (271377011831).

521340624009 is a wasteful number, since it uses less digits than its factorization.

521340624009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138429 (or 138426 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 521340624009 in words is "five hundred twenty-one billion, three hundred forty million, six hundred twenty-four thousand, nine".