646067971 has 2 divisors, whose sum is σ = 646067972. Its totient is φ = 646067970.

The previous prime is 646067951. The next prime is 646068011. The reversal of 646067971 is 179760646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646067971 - 2⁷ = 646067843 is a prime.

It is a super-3 number, since 3×646067971³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (646067921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323033985 + 323033986.

It is an arithmetic number, because the mean of its divisors is an integer number (323033986).

Almost surely, 2^646067971 is an apocalyptic number.

646067971 is a deficient number, since it is larger than the sum of its proper divisors (1).

646067971 is an equidigital number, since it uses as much as digits as its factorization.

646067971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 646067971 is about 25417.8671607198. The cubic root of 646067971 is about 864.4888650547.

The spelling of 646067971 in words is "six hundred forty-six million, sixty-seven thousand, nine hundred seventy-one".