1643485471 has 2 divisors, whose sum is σ = 1643485472. Its totient is φ = 1643485470.

The previous prime is 1643485469. The next prime is 1643485483. The reversal of 1643485471 is 1745843461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1643485471 - 2¹ = 1643485469 is a prime.

It is a super-3 number, since 3×1643485471³ (a number of 29 digits) contains 333 as substring.

Together with 1643485469, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643480471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821742735 + 821742736.

It is an arithmetic number, because the mean of its divisors is an integer number (821742736).

Almost surely, 2^1643485471 is an apocalyptic number.

1643485471 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643485471 is an equidigital number, since it uses as much as digits as its factorization.

1643485471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 43.

The square root of 1643485471 is about 40539.9244079216. The cubic root of 1643485471 is about 1180.1085486181.

The spelling of 1643485471 in words is "one billion, six hundred forty-three million, four hundred eighty-five thousand, four hundred seventy-one".