1293948209 has 2 divisors, whose sum is σ = 1293948210. Its totient is φ = 1293948208.

The previous prime is 1293948193. The next prime is 1293948221. The reversal of 1293948209 is 9028493921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1055925025 + 238023184 = 32495^2 + 15428^2 .

It is a cyclic number.

It is not a de Polignac number, because 1293948209 - 2⁴ = 1293948193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1293948289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 646974104 + 646974105.

It is an arithmetic number, because the mean of its divisors is an integer number (646974105).

Almost surely, 2^1293948209 is an apocalyptic number.

It is an amenable number.

1293948209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1293948209 is an equidigital number, since it uses as much as digits as its factorization.

1293948209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1293948209 is about 35971.4916148886. The cubic root of 1293948209 is about 1089.6966888858.

The spelling of 1293948209 in words is "one billion, two hundred ninety-three million, nine hundred forty-eight thousand, two hundred nine".