16358561 has 4 divisors (see below), whose sum is σ = 16468500. Its totient is φ = 16248624.

The previous prime is 16358557. The next prime is 16358567. The reversal of 16358561 is 16585361.

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 5202961 + 11155600 = 2281^2 + 3340^2 .

It is a cyclic number.

It is not a de Polignac number, because 16358561 - 2² = 16358557 is a prime.

It is a super-4 number, since 4×16358561⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16358567) 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 3 ways as a sum of consecutive naturals, for example, 54746 + ... + 55043.

It is an arithmetic number, because the mean of its divisors is an integer number (4117125).

Almost surely, 2^16358561 is an apocalyptic number.

It is an amenable number.

16358561 is a deficient number, since it is larger than the sum of its proper divisors (109939).

16358561 is a wasteful number, since it uses less digits than its factorization.

16358561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109938.

The product of its digits is 21600, while the sum is 35.

The square root of 16358561 is about 4044.5717943931. The cubic root of 16358561 is about 253.8526487401.

The spelling of 16358561 in words is "sixteen million, three hundred fifty-eight thousand, five hundred sixty-one".