1641563171 has 2 divisors, whose sum is σ = 1641563172. Its totient is φ = 1641563170.

The previous prime is 1641563167. The next prime is 1641563213. The reversal of 1641563171 is 1713651461.

It is a weak prime.

It is an emirp because it is prime and its reverse (1713651461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1641563171 - 2² = 1641563167 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641563101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820781585 + 820781586.

It is an arithmetic number, because the mean of its divisors is an integer number (820781586).

Almost surely, 2^1641563171 is an apocalyptic number.

1641563171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641563171 is an equidigital number, since it uses as much as digits as its factorization.

1641563171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 1641563171 is about 40516.2087441557. The cubic root of 1641563171 is about 1179.6482651259.

The spelling of 1641563171 in words is "one billion, six hundred forty-one million, five hundred sixty-three thousand, one hundred seventy-one".