646854071 has 2 divisors, whose sum is σ = 646854072. Its totient is φ = 646854070.

The previous prime is 646853957. The next prime is 646854073. The reversal of 646854071 is 170458646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646854071 - 2¹⁴ = 646837687 is a prime.

Together with 646854073, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646854073) 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, 323427035 + 323427036.

It is an arithmetic number, because the mean of its divisors is an integer number (323427036).

Almost surely, 2^646854071 is an apocalyptic number.

646854071 is a deficient number, since it is larger than the sum of its proper divisors (1).

646854071 is an equidigital number, since it uses as much as digits as its factorization.

646854071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 646854071 is about 25433.3259916984. The cubic root of 646854071 is about 864.8393437919.

The spelling of 646854071 in words is "six hundred forty-six million, eight hundred fifty-four thousand, seventy-one".