1161530111 has 4 divisors (see below), whose sum is σ = 1327462992. Its totient is φ = 995597232.

The previous prime is 1161530101. The next prime is 1161530113. The reversal of 1161530111 is 1110351611.

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

It is not a de Polignac number, because 1161530111 - 2³⁰ = 87788287 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 (1161530113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82966430 + ... + 82966443.

It is an arithmetic number, because the mean of its divisors is an integer number (331865748).

Almost surely, 2^1161530111 is an apocalyptic number.

1161530111 is a deficient number, since it is larger than the sum of its proper divisors (165932881).

1161530111 is an equidigital number, since it uses as much as digits as its factorization.

1161530111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165932880.

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 1161530111 is about 34081.2281322138. The cubic root of 1161530111 is about 1051.1793584483.

Adding to 1161530111 its reverse (1110351611), we get a palindrome (2271881722).

The spelling of 1161530111 in words is "one billion, one hundred sixty-one million, five hundred thirty thousand, one hundred eleven".