16191647 has 2 divisors, whose sum is σ = 16191648. Its totient is φ = 16191646.

The previous prime is 16191631. The next prime is 16191649. The reversal of 16191647 is 74619161.

It is a strong prime.

It is an emirp because it is prime and its reverse (74619161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16191647 - 2⁴ = 16191631 is a prime.

Together with 16191649, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16191649) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8095823 + 8095824.

It is an arithmetic number, because the mean of its divisors is an integer number (8095824).

Almost surely, 2^16191647 is an apocalyptic number.

16191647 is a deficient number, since it is larger than the sum of its proper divisors (1).

16191647 is an equidigital number, since it uses as much as digits as its factorization.

16191647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 16191647 is about 4023.8845659387. The cubic root of 16191647 is about 252.9863032678.

The spelling of 16191647 in words is "sixteen million, one hundred ninety-one thousand, six hundred forty-seven".