647953 has 2 divisors, whose sum is σ = 647954. Its totient is φ = 647952.

The previous prime is 647951. The next prime is 647963. The reversal of 647953 is 359746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501264 + 146689 = 708^2 + 383^2 .

It is a cyclic number.

It is not a de Polignac number, because 647953 - 2¹ = 647951 is a prime.

Together with 647951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (647951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323976 + 323977.

It is an arithmetic number, because the mean of its divisors is an integer number (323977).

2⁶⁴⁷⁹⁵³ is an apocalyptic number.

It is an amenable number.

647953 is a deficient number, since it is larger than the sum of its proper divisors (1).

647953 is an equidigital number, since it uses as much as digits as its factorization.

647953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 34.

The square root of 647953 is about 804.9552782608. The cubic root of 647953 is about 86.5328820157.

It can be divided in two parts, 647 and 953, that added together give a square (1600 = 40²).

The spelling of 647953 in words is "six hundred forty-seven thousand, nine hundred fifty-three".