521407617447 has 4 divisors (see below), whose sum is σ = 695210156600. Its totient is φ = 347605078296.

The previous prime is 521407617433. The next prime is 521407617463. The reversal of 521407617447 is 744716704125.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 521407617447 - 2¹⁹ = 521407093159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521407617396 and 521407617405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521407617487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86901269572 + ... + 86901269577.

It is an arithmetic number, because the mean of its divisors is an integer number (173802539150).

Almost surely, 2^521407617447 is an apocalyptic number.

521407617447 is a deficient number, since it is larger than the sum of its proper divisors (173802539153).

521407617447 is a wasteful number, since it uses less digits than its factorization.

521407617447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173802539152.

The product of its (nonzero) digits is 1317120, while the sum is 48.

The spelling of 521407617447 in words is "five hundred twenty-one billion, four hundred seven million, six hundred seventeen thousand, four hundred forty-seven".