1233981209 has 2 divisors, whose sum is σ = 1233981210. Its totient is φ = 1233981208.

The previous prime is 1233981167. The next prime is 1233981241. The reversal of 1233981209 is 9021893321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 678342025 + 555639184 = 26045^2 + 23572^2 .

It is a cyclic number.

It is not a de Polignac number, because 1233981209 - 2¹⁶ = 1233915673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1233981299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616990604 + 616990605.

It is an arithmetic number, because the mean of its divisors is an integer number (616990605).

Almost surely, 2^1233981209 is an apocalyptic number.

It is an amenable number.

1233981209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1233981209 is an equidigital number, since it uses as much as digits as its factorization.

1233981209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1233981209 is about 35128.0686773412. The cubic root of 1233981209 is about 1072.5960224320.

The spelling of 1233981209 in words is "one billion, two hundred thirty-three million, nine hundred eighty-one thousand, two hundred nine".