1161111105 has 192 divisors, whose sum is σ = 2665301760. Its totient is φ = 480090240.

The previous prime is 1161111059. The next prime is 1161111113. The reversal of 1161111105 is 5011111611.

It is a happy number.

It is not a de Polignac number, because 1161111105 - 2⁶ = 1161111041 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5893867 + ... + 5894063.

It is an arithmetic number, because the mean of its divisors is an integer number (13881780).

Almost surely, 2^1161111105 is an apocalyptic number.

1161111105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161111105 is an abundant number, since it is smaller than the sum of its proper divisors (1504190655).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161111105 is an equidigital number, since it uses as much as digits as its factorization.

1161111105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 18.

The square root of 1161111105 is about 34075.0804107635. The cubic root of 1161111105 is about 1051.0529437513.

Adding to 1161111105 its reverse (5011111611), we get a palindrome (6172222716).

It can be divided in two parts, 11 and 61111105, that added together give a palindrome (61111116).

The spelling of 1161111105 in words is "one billion, one hundred sixty-one million, one hundred eleven thousand, one hundred five".