1209281273 has 2 divisors, whose sum is σ = 1209281274. Its totient is φ = 1209281272.

The previous prime is 1209281251. The next prime is 1209281279. The reversal of 1209281273 is 3721829021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1207423504 + 1857769 = 34748^2 + 1363^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209281273 - 2¹⁶ = 1209215737 is a prime.

It is a super-2 number, since 2×1209281273² = 2924722394457001058, which contains 22 as substring.

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 (1209281279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604640636 + 604640637.

It is an arithmetic number, because the mean of its divisors is an integer number (604640637).

Almost surely, 2^1209281273 is an apocalyptic number.

It is an amenable number.

1209281273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209281273 is an equidigital number, since it uses as much as digits as its factorization.

1209281273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1209281273 is about 34774.7217530205. The cubic root of 1209281273 is about 1065.3912095518.

The spelling of 1209281273 in words is "one billion, two hundred nine million, two hundred eighty-one thousand, two hundred seventy-three".