646147 has 2 divisors, whose sum is σ = 646148. Its totient is φ = 646146.

The previous prime is 646103. The next prime is 646157. The reversal of 646147 is 741646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646147 is a prime.

It is not a weakly prime, because it can be changed into another prime (646157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323073 + 323074.

It is an arithmetic number, because the mean of its divisors is an integer number (323074).

2⁶⁴⁶¹⁴⁷ is an apocalyptic number.

646147 is a deficient number, since it is larger than the sum of its proper divisors (1).

646147 is an equidigital number, since it uses as much as digits as its factorization.

646147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 646147 is about 803.8326940353. The cubic root of 646147 is about 86.4524112587.

The spelling of 646147 in words is "six hundred forty-six thousand, one hundred forty-seven".