16746521 has 6 divisors (see below), whose sum is σ = 18407466. Its totient is φ = 15224000.

The previous prime is 16746517. The next prime is 16746559. The reversal of 16746521 is 12564761.

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 2758921 = 3740^2 + 1661^2 .

It is not a de Polignac number, because 16746521 - 2² = 16746517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16746511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69080 + ... + 69321.

It is an arithmetic number, because the mean of its divisors is an integer number (3067911).

Almost surely, 2^16746521 is an apocalyptic number.

16746521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16746521 is a deficient number, since it is larger than the sum of its proper divisors (1660945).

16746521 is a wasteful number, since it uses less digits than its factorization.

16746521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138423 (or 138412 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 16746521 is about 4092.2513363673. The cubic root of 16746521 is about 255.8437818474.

The spelling of 16746521 in words is "sixteen million, seven hundred forty-six thousand, five hundred twenty-one".