1121778727 has 2 divisors, whose sum is σ = 1121778728. Its totient is φ = 1121778726.

The previous prime is 1121778709. The next prime is 1121778731. The reversal of 1121778727 is 7278771211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121778727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121778787) 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, 560889363 + 560889364.

It is an arithmetic number, because the mean of its divisors is an integer number (560889364).

Almost surely, 2^1121778727 is an apocalyptic number.

1121778727 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121778727 is an equidigital number, since it uses as much as digits as its factorization.

1121778727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76832, while the sum is 43.

The square root of 1121778727 is about 33492.9653360224. The cubic root of 1121778727 is about 1039.0482932493.

The spelling of 1121778727 in words is "one billion, one hundred twenty-one million, seven hundred seventy-eight thousand, seven hundred twenty-seven".