521503416 has 48 divisors (see below), whose sum is σ = 1614178800. Its totient is φ = 149000832.

The previous prime is 521503391. The next prime is 521503417. The reversal of 521503416 is 614305125.

It is a self number, because there is not a number n which added to its sum of digits gives 521503416.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521503417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 516861 + ... + 517868.

It is an arithmetic number, because the mean of its divisors is an integer number (33628725).

Almost surely, 2^521503416 is an apocalyptic number.

521503416 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

521503416 is an abundant number, since it is smaller than the sum of its proper divisors (1092675384).

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

521503416 is a wasteful number, since it uses less digits than its factorization.

521503416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034748 (or 1034741 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 521503416 is about 22836.4492861741. The cubic root of 521503416 is about 804.9193834113.

The spelling of 521503416 in words is "five hundred twenty-one million, five hundred three thousand, four hundred sixteen".