1220302309 has 2 divisors, whose sum is σ = 1220302310. Its totient is φ = 1220302308.

The previous prime is 1220302297. The next prime is 1220302331. The reversal of 1220302309 is 9032030221.

It is an a-pointer prime, because the next prime (1220302331) can be obtained adding 1220302309 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 894608100 + 325694209 = 29910^2 + 18047^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220302309 - 2²⁷ = 1086084581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220302309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220302399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610151154 + 610151155.

It is an arithmetic number, because the mean of its divisors is an integer number (610151155).

Almost surely, 2^1220302309 is an apocalyptic number.

It is an amenable number.

1220302309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220302309 is an equidigital number, since it uses as much as digits as its factorization.

1220302309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 1220302309 is about 34932.8256658404. The cubic root of 1220302309 is about 1068.6179813720.

The spelling of 1220302309 in words is "one billion, two hundred twenty million, three hundred two thousand, three hundred nine".