1241261209 has 2 divisors, whose sum is σ = 1241261210. Its totient is φ = 1241261208.

The previous prime is 1241261207. The next prime is 1241261233. The reversal of 1241261209 is 9021621421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1078137225 + 163123984 = 32835^2 + 12772^2 .

It is a cyclic number.

It is not a de Polignac number, because 1241261209 - 2¹ = 1241261207 is a prime.

Together with 1241261207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1241261201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620630604 + 620630605.

It is an arithmetic number, because the mean of its divisors is an integer number (620630605).

Almost surely, 2^1241261209 is an apocalyptic number.

It is an amenable number.

1241261209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1241261209 is an equidigital number, since it uses as much as digits as its factorization.

1241261209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1241261209 is about 35231.5371364918. The cubic root of 1241261209 is about 1074.7011850918.

It can be divided in two parts, 1241 and 261209, that added together give a triangular number (262450 = T₇₂₄).

The spelling of 1241261209 in words is "one billion, two hundred forty-one million, two hundred sixty-one thousand, two hundred nine".