521656116 has 12 divisors (see below), whose sum is σ = 1217197632. Its totient is φ = 173885368.

The previous prime is 521656021. The next prime is 521656139. The reversal of 521656116 is 611656125.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21735660 + ... + 21735683.

It is an arithmetic number, because the mean of its divisors is an integer number (101433136).

Almost surely, 2^521656116 is an apocalyptic number.

It is an amenable number.

521656116 is an abundant number, since it is smaller than the sum of its proper divisors (695541516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521656116 is a wasteful number, since it uses less digits than its factorization.

521656116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43471350 (or 43471348 counting only the distinct ones).

The product of its digits is 10800, while the sum is 33.

The square root of 521656116 is about 22839.7923808427. The cubic root of 521656116 is about 804.9979378315.

Subtracting 521656116 from its reverse (611656125), we obtain a palindrome (90000009).

The spelling of 521656116 in words is "five hundred twenty-one million, six hundred fifty-six thousand, one hundred sixteen".