16259561 has 4 divisors (see below), whose sum is σ = 16306500. Its totient is φ = 16212624.

The previous prime is 16259549. The next prime is 16259563. The reversal of 16259561 is 16595261.

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 5736025 + 10523536 = 2395^2 + 3244^2 .

It is a cyclic number.

It is not a de Polignac number, because 16259561 - 2¹⁰ = 16258537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16259563) 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, 22946 + ... + 23643.

It is an arithmetic number, because the mean of its divisors is an integer number (4076625).

Almost surely, 2^16259561 is an apocalyptic number.

It is an amenable number.

16259561 is a deficient number, since it is larger than the sum of its proper divisors (46939).

16259561 is an equidigital number, since it uses as much as digits as its factorization.

16259561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46938.

The product of its digits is 16200, while the sum is 35.

The square root of 16259561 is about 4032.3145958618. The cubic root of 16259561 is about 253.3395172005.

The spelling of 16259561 in words is "sixteen million, two hundred fifty-nine thousand, five hundred sixty-one".