1045443661 has 2 divisors, whose sum is σ = 1045443662. Its totient is φ = 1045443660.

The previous prime is 1045443653. The next prime is 1045443667. The reversal of 1045443661 is 1663445401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538518436 + 506925225 = 23206^2 + 22515^2 .

It is an emirp because it is prime and its reverse (1663445401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1045443661 - 2³ = 1045443653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1045443667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 522721830 + 522721831.

It is an arithmetic number, because the mean of its divisors is an integer number (522721831).

Almost surely, 2^1045443661 is an apocalyptic number.

It is an amenable number.

1045443661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1045443661 is an equidigital number, since it uses as much as digits as its factorization.

1045443661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 1045443661 is about 32333.3212182108. The cubic root of 1045443661 is about 1014.9240516833.

The spelling of 1045443661 in words is "one billion, forty-five million, four hundred forty-three thousand, six hundred sixty-one".