1005541643 has 2 divisors, whose sum is σ = 1005541644. Its totient is φ = 1005541642.

The previous prime is 1005541613. The next prime is 1005541651. The reversal of 1005541643 is 3461455001.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (3461455001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1005541643 - 2²⁸ = 737106187 is a prime.

It is a super-2 number, since 2×1005541643² = 2022227991614278898, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1005541613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502770821 + 502770822.

It is an arithmetic number, because the mean of its divisors is an integer number (502770822).

Almost surely, 2^1005541643 is an apocalyptic number.

1005541643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005541643 is an equidigital number, since it uses as much as digits as its factorization.

1005541643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1005541643 is about 31710.2766150029. The cubic root of 1005541643 is about 1001.8438125990.

Adding to 1005541643 its reverse (3461455001), we get a palindrome (4466996644).

The spelling of 1005541643 in words is "one billion, five million, five hundred forty-one thousand, six hundred forty-three".