521564274 has 192 divisors, whose sum is σ = 1485619200. Its totient is φ = 128304000.

The previous prime is 521564171. The next prime is 521564299. The reversal of 521564274 is 472465125.

It is a happy number.

521564274 is a `hidden beast` number, since 5 + 2 + 1 + 5 + 642 + 7 + 4 = 666.

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, 2620827 + ... + 2621025.

It is an arithmetic number, because the mean of its divisors is an integer number (7737600).

Almost surely, 2^521564274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521564274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (742809600).

521564274 is an abundant number, since it is smaller than the sum of its proper divisors (964054926).

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

521564274 is a wasteful number, since it uses less digits than its factorization.

521564274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 314 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 521564274 is about 22837.7817224003. The cubic root of 521564274 is about 804.9506928121.

The spelling of 521564274 in words is "five hundred twenty-one million, five hundred sixty-four thousand, two hundred seventy-four".