1121806447 has 2 divisors, whose sum is σ = 1121806448. Its totient is φ = 1121806446.

The previous prime is 1121806429. The next prime is 1121806457. The reversal of 1121806447 is 7446081211.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121806447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121806457) 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, 560903223 + 560903224.

It is an arithmetic number, because the mean of its divisors is an integer number (560903224).

Almost surely, 2^1121806447 is an apocalyptic number.

1121806447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121806447 is an equidigital number, since it uses as much as digits as its factorization.

1121806447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1121806447 is about 33493.3791517070. The cubic root of 1121806447 is about 1039.0568517350.

Adding to 1121806447 its reverse (7446081211), we get a palindrome (8567887658).

The spelling of 1121806447 in words is "one billion, one hundred twenty-one million, eight hundred six thousand, four hundred forty-seven".