1181440855 has 16 divisors (see below), whose sum is σ = 1622917440. Its totient is φ = 808803072.

The previous prime is 1181440853. The next prime is 1181440879. The reversal of 1181440855 is 5580441811.

It is not a de Polignac number, because 1181440855 - 2¹ = 1181440853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181440853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5760 + ... + 48949.

It is an arithmetic number, because the mean of its divisors is an integer number (101432340).

Almost surely, 2^1181440855 is an apocalyptic number.

1181440855 is a deficient number, since it is larger than the sum of its proper divisors (441476585).

1181440855 is an equidigital number, since it uses as much as digits as its factorization.

1181440855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55338.

The product of its (nonzero) digits is 25600, while the sum is 37.

The square root of 1181440855 is about 34372.0941317226. The cubic root of 1181440855 is about 1057.1517384772.

The spelling of 1181440855 in words is "one billion, one hundred eighty-one million, four hundred forty thousand, eight hundred fifty-five".