521812317117 has 48 divisors (see below), whose sum is σ = 861605017728. Its totient is φ = 273549260160.

The previous prime is 521812317107. The next prime is 521812317119. The reversal of 521812317117 is 711713218125.

It is not a de Polignac number, because 521812317117 - 2¹⁰ = 521812316093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521812317119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7217367 + ... + 7289307.

It is an arithmetic number, because the mean of its divisors is an integer number (17950104536).

Almost surely, 2^521812317117 is an apocalyptic number.

It is an amenable number.

521812317117 is a deficient number, since it is larger than the sum of its proper divisors (339792700611).

521812317117 is a wasteful number, since it uses less digits than its factorization.

521812317117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72290 (or 72127 counting only the distinct ones).

The product of its digits is 23520, while the sum is 39.

The spelling of 521812317117 in words is "five hundred twenty-one billion, eight hundred twelve million, three hundred seventeen thousand, one hundred seventeen".