999521216 has 28 divisors (see below), whose sum is σ = 1995613992. Its totient is φ = 496689408.

The previous prime is 999521213. The next prime is 999521227. The reversal of 999521216 is 612125999.

It is a super-2 number, since 2×999521216² = 1998085322468237312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999521213) 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 3 ways as a sum of consecutive naturals, for example, 37475 + ... + 58338.

Almost surely, 2^999521216 is an apocalyptic number.

It is an amenable number.

999521216 is a deficient number, since it is larger than the sum of its proper divisors (996092776).

999521216 is a wasteful number, since it uses less digits than its factorization.

999521216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95988 (or 95978 counting only the distinct ones).

The product of its digits is 87480, while the sum is 44.

The square root of 999521216 is about 31615.2054556032. The cubic root of 999521216 is about 999.8403798561.

The spelling of 999521216 in words is "nine hundred ninety-nine million, five hundred twenty-one thousand, two hundred sixteen".