647659 has 2 divisors, whose sum is σ = 647660. Its totient is φ = 647658.

The previous prime is 647651. The next prime is 647663. The reversal of 647659 is 956746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647659 - 2³ = 647651 is a prime.

It is not a weakly prime, because it can be changed into another prime (647651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323829 + 323830.

It is an arithmetic number, because the mean of its divisors is an integer number (323830).

2⁶⁴⁷⁶⁵⁹ is an apocalyptic number.

647659 is a deficient number, since it is larger than the sum of its proper divisors (1).

647659 is an equidigital number, since it uses as much as digits as its factorization.

647659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 647659 is about 804.7726386999. The cubic root of 647659 is about 86.5197923235.

The spelling of 647659 in words is "six hundred forty-seven thousand, six hundred fifty-nine".