521490552 has 64 divisors (see below), whose sum is σ = 1427016960. Its totient is φ = 157497600.

The previous prime is 521490491. The next prime is 521490559. The reversal of 521490552 is 255094125.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521490559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79477 + ... + 85787.

It is an arithmetic number, because the mean of its divisors is an integer number (22297140).

Almost surely, 2^521490552 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 521490552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (713508480).

521490552 is an abundant number, since it is smaller than the sum of its proper divisors (905526408).

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

521490552 is a wasteful number, since it uses less digits than its factorization.

521490552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6644 (or 6640 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 521490552 is about 22836.1676294426. The cubic root of 521490552 is about 804.9127650027.

The spelling of 521490552 in words is "five hundred twenty-one million, four hundred ninety thousand, five hundred fifty-two".