16464509 has 4 divisors (see below), whose sum is σ = 16479420. Its totient is φ = 16449600.

The previous prime is 16464499. The next prime is 16464521. The reversal of 16464509 is 90546461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5508409 + 10956100 = 2347^2 + 3310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16464509 is a prime.

It is a super-2 number, since 2×16464509² = 542160113222162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16464529) 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, 5654 + ... + 8055.

It is an arithmetic number, because the mean of its divisors is an integer number (4119855).

Almost surely, 2^16464509 is an apocalyptic number.

It is an amenable number.

16464509 is a deficient number, since it is larger than the sum of its proper divisors (14911).

16464509 is a wasteful number, since it uses less digits than its factorization.

16464509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14910.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 16464509 is about 4057.6482104786. The cubic root of 16464509 is about 254.3995046089.

The spelling of 16464509 in words is "sixteen million, four hundred sixty-four thousand, five hundred nine".