1171555555 has 4 divisors (see below), whose sum is σ = 1405866672. Its totient is φ = 937244440.

The previous prime is 1171555549. The next prime is 1171555571. The reversal of 1171555555 is 5555551711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5555551711 = 43 ⋅129198877.

It is not a de Polignac number, because 1171555555 - 2³ = 1171555547 is a prime.

It is a Duffinian number.

1171555555 is a modest number, since divided by 55555 gives 11715 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117155551 + ... + 117155560.

It is an arithmetic number, because the mean of its divisors is an integer number (351466668).

Almost surely, 2^1171555555 is an apocalyptic number.

1171555555 is a deficient number, since it is larger than the sum of its proper divisors (234311117).

1171555555 is an equidigital number, since it uses as much as digits as its factorization.

1171555555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234311116.

The product of its digits is 109375, while the sum is 40.

The square root of 1171555555 is about 34227.9937332003. The cubic root of 1171555555 is about 1054.1950254643.

The spelling of 1171555555 in words is "one billion, one hundred seventy-one million, five hundred fifty-five thousand, five hundred fifty-five".