1023204515209 has 2 divisors, whose sum is σ = 1023204515210. Its totient is φ = 1023204515208.

The previous prime is 1023204515191. The next prime is 1023204515243. The reversal of 1023204515209 is 9025154023201.

It is an a-pointer prime, because the next prime (1023204515243) can be obtained adding 1023204515209 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1006259765625 + 16944749584 = 1003125^2 + 130172^2 .

It is an emirp because it is prime and its reverse (9025154023201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1023204515209 - 2⁹ = 1023204514697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1023201515209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511602257604 + 511602257605.

It is an arithmetic number, because the mean of its divisors is an integer number (511602257605).

Almost surely, 2^{1023204515209} is an apocalyptic number.

It is an amenable number.

1023204515209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023204515209 is an equidigital number, since it uses as much as digits as its factorization.

1023204515209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 1023204515209 in words is "one trillion, twenty-three billion, two hundred four million, five hundred fifteen thousand, two hundred nine".