521317853 has 8 divisors (see below), whose sum is σ = 609647808. Its totient is φ = 436451904.

The previous prime is 521317831. The next prime is 521317871. The reversal of 521317853 is 358713125.

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

It is not a de Polignac number, because 521317853 - 2⁶ = 521317789 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521317873) 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, 865676 + ... + 866277.

It is an arithmetic number, because the mean of its divisors is an integer number (76205976).

Almost surely, 2^521317853 is an apocalyptic number.

It is an amenable number.

521317853 is a deficient number, since it is larger than the sum of its proper divisors (88329955).

521317853 is a wasteful number, since it uses less digits than its factorization.

521317853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732003.

The product of its digits is 25200, while the sum is 35.

The square root of 521317853 is about 22832.3860557761. The cubic root of 521317853 is about 804.8239024294.

The spelling of 521317853 in words is "five hundred twenty-one million, three hundred seventeen thousand, eight hundred fifty-three".