1161331055 has 4 divisors (see below), whose sum is σ = 1393597272. Its totient is φ = 929064840.

The previous prime is 1161331051. The next prime is 1161331069. The reversal of 1161331055 is 5501331611.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1161331055 - 2² = 1161331051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161331051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116133101 + ... + 116133110.

It is an arithmetic number, because the mean of its divisors is an integer number (348399318).

Almost surely, 2^1161331055 is an apocalyptic number.

1161331055 is a deficient number, since it is larger than the sum of its proper divisors (232266217).

1161331055 is an equidigital number, since it uses as much as digits as its factorization.

1161331055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232266216.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 1161331055 is about 34078.3076897900. The cubic root of 1161331055 is about 1051.1193067657.

Adding to 1161331055 its reverse (5501331611), we get a palindrome (6662662666).

The spelling of 1161331055 in words is "one billion, one hundred sixty-one million, three hundred thirty-one thousand, fifty-five".