647149 has 6 divisors (see below), whose sum is σ = 664206. Its totient is φ = 630360.

The previous prime is 647147. The next prime is 647161. The reversal of 647149 is 941746.

It can be written as a sum of positive squares in only one way, i.e., 381924 + 265225 = 618^2 + 515^2 .

It is not a de Polignac number, because 647149 - 2¹ = 647147 is a prime.

It is a Duffinian number.

647149 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 647149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6232 + ... + 6334.

It is an arithmetic number, because the mean of its divisors is an integer number (110701).

2⁶⁴⁷¹⁴⁹ is an apocalyptic number.

It is an amenable number.

647149 is a deficient number, since it is larger than the sum of its proper divisors (17057).

647149 is an equidigital number, since it uses as much as digits as its factorization.

647149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 164 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 647149 is about 804.4557166184. The cubic root of 647149 is about 86.4970763154.

The spelling of 647149 in words is "six hundred forty-seven thousand, one hundred forty-nine".