1643510741 has 2 divisors, whose sum is σ = 1643510742. Its totient is φ = 1643510740.

The previous prime is 1643510689. The next prime is 1643510753. The reversal of 1643510741 is 1470153461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1573788241 + 69722500 = 39671^2 + 8350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643510741 - 2¹⁸ = 1643248597 is a prime.

It is a super-2 number, since 2×1643510741² = 5402255111564738162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1643510698 and 1643510707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643510941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821755370 + 821755371.

It is an arithmetic number, because the mean of its divisors is an integer number (821755371).

Almost surely, 2^1643510741 is an apocalyptic number.

It is an amenable number.

1643510741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643510741 is an equidigital number, since it uses as much as digits as its factorization.

1643510741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1643510741 is about 40540.2360747936. The cubic root of 1643510741 is about 1180.1145969811.

The spelling of 1643510741 in words is "one billion, six hundred forty-three million, five hundred ten thousand, seven hundred forty-one".