521693016 has 64 divisors (see below), whose sum is σ = 1406949600. Its totient is φ = 160247808.

The previous prime is 521692999. The next prime is 521693041. The reversal of 521693016 is 610396125.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257640 + ... + 259656.

Almost surely, 2^521693016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521693016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703474800).

521693016 is an abundant number, since it is smaller than the sum of its proper divisors (885256584).

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

521693016 is a wasteful number, since it uses less digits than its factorization.

521693016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2868 (or 2864 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 521693016 is about 22840.6001672460. The cubic root of 521693016 is about 805.0169182304.

The spelling of 521693016 in words is "five hundred twenty-one million, six hundred ninety-three thousand, sixteen".