521611272 has 384 divisors, whose sum is σ = 1930521600. Its totient is φ = 128894976.

The previous prime is 521611249. The next prime is 521611291. The reversal of 521611272 is 272116125.

521611272 is a `hidden beast` number, since 5 + 21 + 611 + 27 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2338953 + ... + 2339175.

It is an arithmetic number, because the mean of its divisors is an integer number (5027400).

Almost surely, 2^521611272 is an apocalyptic number.

521611272 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521611272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (965260800).

521611272 is an abundant number, since it is smaller than the sum of its proper divisors (1408910328).

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

521611272 is a wasteful number, since it uses less digits than its factorization.

521611272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 265 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 521611272 is about 22838.8106520458. The cubic root of 521611272 is about 804.9748700410.

Adding to 521611272 its reverse (272116125), we get a palindrome (793727397).

The spelling of 521611272 in words is "five hundred twenty-one million, six hundred eleven thousand, two hundred seventy-two".