1494278809 has 2 divisors, whose sum is σ = 1494278810. Its totient is φ = 1494278808.

The previous prime is 1494278777. The next prime is 1494278827. The reversal of 1494278809 is 9088724941.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 754710784 + 739568025 = 27472^2 + 27195^2 .

It is an emirp because it is prime and its reverse (9088724941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1494278809 - 2⁵ = 1494278777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1494278909) 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, 747139404 + 747139405.

It is an arithmetic number, because the mean of its divisors is an integer number (747139405).

Almost surely, 2^1494278809 is an apocalyptic number.

It is an amenable number.

1494278809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1494278809 is an equidigital number, since it uses as much as digits as its factorization.

1494278809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 1494278809 is about 38655.9026411233. The cubic root of 1494278809 is about 1143.2570263502.

The spelling of 1494278809 in words is "one billion, four hundred ninety-four million, two hundred seventy-eight thousand, eight hundred nine".