16521992 has 16 divisors (see below), whose sum is σ = 31022460. Its totient is φ = 8249344.

The previous prime is 16521991. The next prime is 16522003. The reversal of 16521992 is 29912561.

It can be written as a sum of positive squares in 2 ways, for example, as 15792676 + 729316 = 3974^2 + 854^2 .

It is not an unprimeable number, because it can be changed into a prime (16521991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8888 + ... + 10584.

Almost surely, 2^16521992 is an apocalyptic number.

It is an amenable number.

16521992 is a deficient number, since it is larger than the sum of its proper divisors (14500468).

16521992 is a wasteful number, since it uses less digits than its factorization.

16521992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920 (or 2916 counting only the distinct ones).

The product of its digits is 9720, while the sum is 35.

The square root of 16521992 is about 4064.7253289737. The cubic root of 16521992 is about 254.6952247547.

The spelling of 16521992 in words is "sixteen million, five hundred twenty-one thousand, nine hundred ninety-two".