521445016 has 32 divisors (see below), whose sum is σ = 998866080. Its totient is φ = 255136000.

The previous prime is 521445007. The next prime is 521445061. The reversal of 521445016 is 610544125.

It is a super-2 number, since 2×521445016² = 543809809422480512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74466 + ... + 81166.

It is an arithmetic number, because the mean of its divisors is an integer number (31214565).

Almost surely, 2^521445016 is an apocalyptic number.

It is an amenable number.

521445016 is a deficient number, since it is larger than the sum of its proper divisors (477421064).

521445016 is a wasteful number, since it uses less digits than its factorization.

521445016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6915 (or 6911 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 521445016 is about 22835.1705927501. The cubic root of 521445016 is about 804.8893362788.

The spelling of 521445016 in words is "five hundred twenty-one million, four hundred forty-five thousand, sixteen".