521643116 has 6 divisors (see below), whose sum is σ = 912875460. Its totient is φ = 260821556.

The previous prime is 521643071. The next prime is 521643121. The reversal of 521643116 is 611346125.

It is a happy number.

It is a super-2 number, since 2×521643116² = 544223080940378912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65205386 + ... + 65205393.

It is an arithmetic number, because the mean of its divisors is an integer number (152145910).

Almost surely, 2^521643116 is an apocalyptic number.

It is an amenable number.

521643116 is a deficient number, since it is larger than the sum of its proper divisors (391232344).

521643116 is a wasteful number, since it uses less digits than its factorization.

521643116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130410783 (or 130410781 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 521643116 is about 22839.5077880413. The cubic root of 521643116 is about 804.9912507569.

The spelling of 521643116 in words is "five hundred twenty-one million, six hundred forty-three thousand, one hundred sixteen".