1671543641 has 2 divisors, whose sum is σ = 1671543642. Its totient is φ = 1671543640.

The previous prime is 1671543617. The next prime is 1671543659. The reversal of 1671543641 is 1463451761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1664232025 + 7311616 = 40795^2 + 2704^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671543641 - 2³⁰ = 597801817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1671543595 and 1671543604.

It is not a weakly prime, because it can be changed into another prime (1671543941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835771820 + 835771821.

It is an arithmetic number, because the mean of its divisors is an integer number (835771821).

Almost surely, 2^1671543641 is an apocalyptic number.

It is an amenable number.

1671543641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671543641 is an equidigital number, since it uses as much as digits as its factorization.

1671543641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 1671543641 is about 40884.5159076147. The cubic root of 1671543641 is about 1186.7864338134.

The spelling of 1671543641 in words is "one billion, six hundred seventy-one million, five hundred forty-three thousand, six hundred forty-one".