647061 has 4 divisors (see below), whose sum is σ = 862752. Its totient is φ = 431372.

The previous prime is 647057. The next prime is 647069. The reversal of 647061 is 160746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647061 - 2² = 647057 is a prime.

It is a D-number.

It is a Curzon number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107841 + ... + 107846.

It is an arithmetic number, because the mean of its divisors is an integer number (215688).

2⁶⁴⁷⁰⁶¹ is an apocalyptic number.

It is an amenable number.

647061 is a deficient number, since it is larger than the sum of its proper divisors (215691).

647061 is a wasteful number, since it uses less digits than its factorization.

647061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215690.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 647061 is about 804.4010193927. The cubic root of 647061 is about 86.4931554832.

The spelling of 647061 in words is "six hundred forty-seven thousand, sixty-one".