1209734321 has 2 divisors, whose sum is σ = 1209734322. Its totient is φ = 1209734320.

The previous prime is 1209734311. The next prime is 1209734353. The reversal of 1209734321 is 1234379021.

It is an a-pointer prime, because the next prime (1209734353) can be obtained adding 1209734321 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1014741025 + 194993296 = 31855^2 + 13964^2 .

It is an emirp because it is prime and its reverse (1234379021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1209734321 - 2¹⁸ = 1209472177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1209734311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604867160 + 604867161.

It is an arithmetic number, because the mean of its divisors is an integer number (604867161).

Almost surely, 2^1209734321 is an apocalyptic number.

It is an amenable number.

1209734321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209734321 is an equidigital number, since it uses as much as digits as its factorization.

1209734321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 1209734321 is about 34781.2351850822. The cubic root of 1209734321 is about 1065.5242398355.

The spelling of 1209734321 in words is "one billion, two hundred nine million, seven hundred thirty-four thousand, three hundred twenty-one".