641217971 has 2 divisors, whose sum is σ = 641217972. Its totient is φ = 641217970.

The previous prime is 641217953. The next prime is 641217977. The reversal of 641217971 is 179712146.

641217971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641217971 is a prime.

It is a super-2 number, since 2×641217971² = 822320972666713682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641217977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320608985 + 320608986.

It is an arithmetic number, because the mean of its divisors is an integer number (320608986).

Almost surely, 2^641217971 is an apocalyptic number.

641217971 is a deficient number, since it is larger than the sum of its proper divisors (1).

641217971 is an equidigital number, since it uses as much as digits as its factorization.

641217971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 38.

The square root of 641217971 is about 25322.2821048973. The cubic root of 641217971 is about 862.3202043766.

The spelling of 641217971 in words is "six hundred forty-one million, two hundred seventeen thousand, nine hundred seventy-one".