521517402 has 144 divisors (see below), whose sum is σ = 1375583040. Its totient is φ = 139812480.

The previous prime is 521517383. The next prime is 521517407. The reversal of 521517402 is 204715125.

It is not an unprimeable number, because it can be changed into a prime (521517407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7144038 + ... + 7144110.

It is an arithmetic number, because the mean of its divisors is an integer number (9552660).

Almost surely, 2^521517402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521517402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (687791520).

521517402 is an abundant number, since it is smaller than the sum of its proper divisors (854065638).

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

521517402 is a wasteful number, since it uses less digits than its factorization.

521517402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 521517402 is about 22836.7555051062. The cubic root of 521517402 is about 804.9265789550.

The spelling of 521517402 in words is "five hundred twenty-one million, five hundred seventeen thousand, four hundred two".