16196561 has 2 divisors, whose sum is σ = 16196562. Its totient is φ = 16196560.

The previous prime is 16196533. The next prime is 16196573. The reversal of 16196561 is 16569161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15484225 + 712336 = 3935^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 16196561 - 2⁶ = 16196497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16198561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8098280 + 8098281.

It is an arithmetic number, because the mean of its divisors is an integer number (8098281).

Almost surely, 2^16196561 is an apocalyptic number.

It is an amenable number.

16196561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16196561 is an equidigital number, since it uses as much as digits as its factorization.

16196561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The square root of 16196561 is about 4024.4951236149. The cubic root of 16196561 is about 253.0118936016.

The spelling of 16196561 in words is "sixteen million, one hundred ninety-six thousand, five hundred sixty-one".