521681052 has 12 divisors (see below), whose sum is σ = 1217255816. Its totient is φ = 173893680.

The previous prime is 521681033. The next prime is 521681053. The reversal of 521681052 is 250186125.

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

It is a super-2 number, since 2×521681052² = 544302240031653408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521681053) 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, 21736699 + ... + 21736722.

Almost surely, 2^521681052 is an apocalyptic number.

It is an amenable number.

521681052 is an abundant number, since it is smaller than the sum of its proper divisors (695574764).

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

521681052 is a wasteful number, since it uses less digits than its factorization.

521681052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43473428 (or 43473426 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 521681052 is about 22840.3382636948. The cubic root of 521681052 is about 805.0107643585.

It can be divided in two parts, 5216 and 81052, that added together give a palindrome (86268).

The spelling of 521681052 in words is "five hundred twenty-one million, six hundred eighty-one thousand, fifty-two".