15647 has 2 divisors, whose sum is σ = 15648. Its totient is φ = 15646.

The previous prime is 15643. The next prime is 15649. The reversal of 15647 is 74651.

15647 is nontrivially palindromic in base 4.

It is a strong prime.

15647 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 15647 - 2² = 15643 is a prime.

Together with 15649, 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 (15641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7823 + 7824.

It is an arithmetic number, because the mean of its divisors is an integer number (7824).

2¹⁵⁶⁴⁷ is an apocalyptic number.

15647 is a deficient number, since it is larger than the sum of its proper divisors (1).

15647 is an equidigital number, since it uses as much as digits as its factorization.

15647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 23.

The square root of 15647 is about 125.0879690458. The cubic root of 15647 is about 25.0117278308.

The spelling of 15647 in words is "fifteen thousand, six hundred forty-seven".