16102561 has 4 divisors (see below), whose sum is σ = 16128324. Its totient is φ = 16076800.

The previous prime is 16102459. The next prime is 16102571. The reversal of 16102561 is 16520161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16520161 = 7 ⋅2360023.

It can be written as a sum of positive squares in 2 ways, for example, as 11350161 + 4752400 = 3369^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 16102561 - 2⁹ = 16102049 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16102571) 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, 11920 + ... + 13201.

It is an arithmetic number, because the mean of its divisors is an integer number (4032081).

Almost surely, 2^16102561 is an apocalyptic number.

It is an amenable number.

16102561 is a deficient number, since it is larger than the sum of its proper divisors (25763).

16102561 is an equidigital number, since it uses as much as digits as its factorization.

16102561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25762.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 16102561 is about 4012.7996461324. The cubic root of 16102561 is about 252.5214751529.

The spelling of 16102561 in words is "sixteen million, one hundred two thousand, five hundred sixty-one".