1045543981 has 2 divisors, whose sum is σ = 1045543982. Its totient is φ = 1045543980.

The previous prime is 1045543943. The next prime is 1045544009. The reversal of 1045543981 is 1893455401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1016015625 + 29528356 = 31875^2 + 5434^2 .

It is an emirp because it is prime and its reverse (1893455401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1045543981 - 2⁷ = 1045543853 is a prime.

It is a super-2 number, since 2×1045543981² = 2186324432410656722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1045543181) 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, 522771990 + 522771991.

It is an arithmetic number, because the mean of its divisors is an integer number (522771991).

Almost surely, 2^1045543981 is an apocalyptic number.

It is an amenable number.

1045543981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1045543981 is an equidigital number, since it uses as much as digits as its factorization.

1045543981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 1045543981 is about 32334.8725217837. The cubic root of 1045543981 is about 1014.9565144320.

The spelling of 1045543981 in words is "one billion, forty-five million, five hundred forty-three thousand, nine hundred eighty-one".