641971471 has 2 divisors, whose sum is σ = 641971472. Its totient is φ = 641971470.

The previous prime is 641971441. The next prime is 641971513. The reversal of 641971471 is 174179146.

641971471 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641971471 - 2⁵ = 641971439 is a prime.

It is a super-3 number, since 3×641971471³ (a number of 27 digits) contains 333 as substring.

It is equal to p_33397771 and since 641971471 and 33397771 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641971441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320985735 + 320985736.

It is an arithmetic number, because the mean of its divisors is an integer number (320985736).

Almost surely, 2^641971471 is an apocalyptic number.

641971471 is a deficient number, since it is larger than the sum of its proper divisors (1).

641971471 is an equidigital number, since it uses as much as digits as its factorization.

641971471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 641971471 is about 25337.1559374765. The cubic root of 641971471 is about 862.6578451152.

The spelling of 641971471 in words is "six hundred forty-one million, nine hundred seventy-one thousand, four hundred seventy-one".