1161117111 has 32 divisors (see below), whose sum is σ = 1933682688. Its totient is φ = 602079840.

The previous prime is 1161117107. The next prime is 1161117161. The reversal of 1161117111 is 1117111611.

It is not a de Polignac number, because 1161117111 - 2² = 1161117107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161117161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131316 + ... + 139878.

It is an arithmetic number, because the mean of its divisors is an integer number (60427584).

Almost surely, 2^1161117111 is an apocalyptic number.

1161117111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1161117111 is a deficient number, since it is larger than the sum of its proper divisors (772565577).

1161117111 is a wasteful number, since it uses less digits than its factorization.

1161117111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9171.

The product of its digits is 42, while the sum is 21.

The square root of 1161117111 is about 34075.1685395685. The cubic root of 1161117111 is about 1051.0547559847.

Adding to 1161117111 its reverse (1117111611), we get a palindrome (2278228722).

The spelling of 1161117111 in words is "one billion, one hundred sixty-one million, one hundred seventeen thousand, one hundred eleven".