1171981055 has 16 divisors (see below), whose sum is σ = 1629309504. Its totient is φ = 792633600.

The previous prime is 1171981033. The next prime is 1171981067. The reversal of 1171981055 is 5501891711.

It is not a de Polignac number, because 1171981055 - 2¹⁴ = 1171964671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226796 + ... + 231905.

It is an arithmetic number, because the mean of its divisors is an integer number (101831844).

Almost surely, 2^1171981055 is an apocalyptic number.

1171981055 is a deficient number, since it is larger than the sum of its proper divisors (457328449).

1171981055 is an equidigital number, since it uses as much as digits as its factorization.

1171981055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458786.

The product of its (nonzero) digits is 12600, while the sum is 38.

The square root of 1171981055 is about 34234.2088414498. The cubic root of 1171981055 is about 1054.3226352016.

The spelling of 1171981055 in words is "one billion, one hundred seventy-one million, nine hundred eighty-one thousand, fifty-five".