647085623 has 2 divisors, whose sum is σ = 647085624. Its totient is φ = 647085622.

The previous prime is 647085617. The next prime is 647085643. The reversal of 647085623 is 326580746.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647085623 - 2²⁰ = 646037047 is a prime.

It is a super-5 number, since 5×647085623⁵ (a number of 45 digits) contains 55555 as substring.

It is equal to p_33649718 and since 647085623 and 33649718 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647085643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323542811 + 323542812.

It is an arithmetic number, because the mean of its divisors is an integer number (323542812).

Almost surely, 2^647085623 is an apocalyptic number.

647085623 is a deficient number, since it is larger than the sum of its proper divisors (1).

647085623 is an equidigital number, since it uses as much as digits as its factorization.

647085623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 647085623 is about 25437.8777220113. The cubic root of 647085623 is about 864.9425259462.

The spelling of 647085623 in words is "six hundred forty-seven million, eighty-five thousand, six hundred twenty-three".