16324561 has 4 divisors (see below), whose sum is σ = 17808624. Its totient is φ = 14840500.

The previous prime is 16324541. The next prime is 16324597. The reversal of 16324561 is 16542361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16324561 - 2⁷ = 16324433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16324531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742015 + ... + 742036.

It is an arithmetic number, because the mean of its divisors is an integer number (4452156).

Almost surely, 2^16324561 is an apocalyptic number.

16324561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16324561 is a deficient number, since it is larger than the sum of its proper divisors (1484063).

16324561 is a wasteful number, since it uses less digits than its factorization.

16324561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484062.

The product of its digits is 4320, while the sum is 28.

The square root of 16324561 is about 4040.3664437771. The cubic root of 16324561 is about 253.6766557420.

It can be divided in two parts, 163245 and 61, that added together give a triangular number (163306 = T₅₇₁).

The spelling of 16324561 in words is "sixteen million, three hundred twenty-four thousand, five hundred sixty-one".