648605171 has 2 divisors, whose sum is σ = 648605172. Its totient is φ = 648605170.

The previous prime is 648605107. The next prime is 648605179. The reversal of 648605171 is 171506846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648605171 - 2⁶ = 648605107 is a prime.

It is not a weakly prime, because it can be changed into another prime (648605179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324302585 + 324302586.

It is an arithmetic number, because the mean of its divisors is an integer number (324302586).

Almost surely, 2^648605171 is an apocalyptic number.

648605171 is a deficient number, since it is larger than the sum of its proper divisors (1).

648605171 is an equidigital number, since it uses as much as digits as its factorization.

648605171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 648605171 is about 25467.7280298027. The cubic root of 648605171 is about 865.6190434341.

The spelling of 648605171 in words is "six hundred forty-eight million, six hundred five thousand, one hundred seventy-one".