1247798287 has 2 divisors, whose sum is σ = 1247798288. Its totient is φ = 1247798286.

The previous prime is 1247798281. The next prime is 1247798291. The reversal of 1247798287 is 7828977421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1247798287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1247798281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623899143 + 623899144.

It is an arithmetic number, because the mean of its divisors is an integer number (623899144).

Almost surely, 2^1247798287 is an apocalyptic number.

1247798287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247798287 is an equidigital number, since it uses as much as digits as its factorization.

1247798287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3161088, while the sum is 55.

The square root of 1247798287 is about 35324.1884124745. The cubic root of 1247798287 is about 1076.5845137383.

The spelling of 1247798287 in words is "one billion, two hundred forty-seven million, seven hundred ninety-eight thousand, two hundred eighty-seven".