1171555243 has 2 divisors, whose sum is σ = 1171555244. Its totient is φ = 1171555242.

The previous prime is 1171555237. The next prime is 1171555247. The reversal of 1171555243 is 3425551711.

It is a strong prime.

It is an emirp because it is prime and its reverse (3425551711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1171555243 - 2⁵ = 1171555211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1171555199 and 1171555208.

It is not a weakly prime, because it can be changed into another prime (1171555247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585777621 + 585777622.

It is an arithmetic number, because the mean of its divisors is an integer number (585777622).

Almost surely, 2^1171555243 is an apocalyptic number.

1171555243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171555243 is an equidigital number, since it uses as much as digits as its factorization.

1171555243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21000, while the sum is 34.

The square root of 1171555243 is about 34227.9891755271. The cubic root of 1171555243 is about 1054.1949318825.

The spelling of 1171555243 in words is "one billion, one hundred seventy-one million, five hundred fifty-five thousand, two hundred forty-three".