1109178997 has 2 divisors, whose sum is σ = 1109178998. Its totient is φ = 1109178996.

The previous prime is 1109178953. The next prime is 1109179021. The reversal of 1109178997 is 7998719011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 953203876 + 155975121 = 30874^2 + 12489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109178997 - 2¹⁵ = 1109146229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109178397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554589498 + 554589499.

It is an arithmetic number, because the mean of its divisors is an integer number (554589499).

Almost surely, 2^1109178997 is an apocalyptic number.

It is an amenable number.

1109178997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109178997 is an equidigital number, since it uses as much as digits as its factorization.

1109178997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 52.

The square root of 1109178997 is about 33304.3390116063. The cubic root of 1109178997 is about 1035.1434675526.

The spelling of 1109178997 in words is "one billion, one hundred nine million, one hundred seventy-eight thousand, nine hundred ninety-seven".