647741 has 2 divisors, whose sum is σ = 647742. Its totient is φ = 647740.

The previous prime is 647723. The next prime is 647743. The reversal of 647741 is 147746.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 143641 = 710^2 + 379^2 .

It is a cyclic number.

It is not a de Polignac number, because 647741 - 2¹⁴ = 631357 is a prime.

Together with 647743, 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 (647743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323870 + 323871.

It is an arithmetic number, because the mean of its divisors is an integer number (323871).

2⁶⁴⁷⁷⁴¹ is an apocalyptic number.

It is an amenable number.

647741 is a deficient number, since it is larger than the sum of its proper divisors (1).

647741 is an equidigital number, since it uses as much as digits as its factorization.

647741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 29.

The square root of 647741 is about 804.8235831535. The cubic root of 647741 is about 86.5234435883.

The spelling of 647741 in words is "six hundred forty-seven thousand, seven hundred forty-one".