16142561 has 4 divisors (see below), whose sum is σ = 16536324. Its totient is φ = 15748800.

The previous prime is 16142551. The next prime is 16142569. The reversal of 16142561 is 16524161.

16142561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16524161 = 4057 ⋅4073.

It can be written as a sum of positive squares in 2 ways, for example, as 2958400 + 13184161 = 1720^2 + 3631^2 .

It is a cyclic number.

It is not a de Polignac number, because 16142561 - 2¹⁰ = 16141537 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 16142561.

It is not an unprimeable number, because it can be changed into a prime (16142569) 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, 196820 + ... + 196901.

It is an arithmetic number, because the mean of its divisors is an integer number (4134081).

Almost surely, 2^16142561 is an apocalyptic number.

It is an amenable number.

16142561 is a deficient number, since it is larger than the sum of its proper divisors (393763).

16142561 is an equidigital number, since it uses as much as digits as its factorization.

16142561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393762.

The product of its digits is 1440, while the sum is 26.

The square root of 16142561 is about 4017.7806062551. The cubic root of 16142561 is about 252.7303965114.

The spelling of 16142561 in words is "sixteen million, one hundred forty-two thousand, five hundred sixty-one".