16539641 has 2 divisors, whose sum is σ = 16539642. Its totient is φ = 16539640.

The previous prime is 16539631. The next prime is 16539643. The reversal of 16539641 is 14693561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10214416 + 6325225 = 3196^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 16539641 - 2⁶ = 16539577 is a prime.

It is a Sophie Germain prime.

Together with 16539643, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16539643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8269820 + 8269821.

It is an arithmetic number, because the mean of its divisors is an integer number (8269821).

Almost surely, 2^16539641 is an apocalyptic number.

It is an amenable number.

16539641 is a deficient number, since it is larger than the sum of its proper divisors (1).

16539641 is an equidigital number, since it uses as much as digits as its factorization.

16539641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 16539641 is about 4066.8957449140. The cubic root of 16539641 is about 254.7858820312.

The spelling of 16539641 in words is "sixteen million, five hundred thirty-nine thousand, six hundred forty-one".