1161561112 has 8 divisors (see below), whose sum is σ = 2177927100. Its totient is φ = 580780552.

The previous prime is 1161561097. The next prime is 1161561113. The reversal of 1161561112 is 2111651611.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161561113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72597562 + ... + 72597577.

Almost surely, 2^1161561112 is an apocalyptic number.

It is an amenable number.

1161561112 is a deficient number, since it is larger than the sum of its proper divisors (1016365988).

1161561112 is a wasteful number, since it uses less digits than its factorization.

1161561112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145195145 (or 145195141 counting only the distinct ones).

The product of its digits is 360, while the sum is 25.

The square root of 1161561112 is about 34081.6829396672. The cubic root of 1161561112 is about 1051.1887102854.

It can be divided in two parts, 11615 and 61112, that added together give a palindrome (72727).

The spelling of 1161561112 in words is "one billion, one hundred sixty-one million, five hundred sixty-one thousand, one hundred twelve".