1023443209 has 2 divisors, whose sum is σ = 1023443210. Its totient is φ = 1023443208.

The previous prime is 1023443009. The next prime is 1023443219. The reversal of 1023443209 is 9023443201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 706496400 + 316946809 = 26580^2 + 17803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023443209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1023443219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511721604 + 511721605.

It is an arithmetic number, because the mean of its divisors is an integer number (511721605).

Almost surely, 2^1023443209 is an apocalyptic number.

It is an amenable number.

1023443209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023443209 is an equidigital number, since it uses as much as digits as its factorization.

1023443209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1023443209 is about 31991.2989576854. The cubic root of 1023443209 is about 1007.7541211954.

The spelling of 1023443209 in words is "one billion, twenty-three million, four hundred forty-three thousand, two hundred nine".