1161561132 has 18 divisors (see below), whose sum is σ = 2936168508. Its totient is φ = 387187032.

The previous prime is 1161561131. The next prime is 1161561133. The reversal of 1161561132 is 2311651611.

1161561132 is a `hidden beast` number, since 1 + 1 + 6 + 15 + 611 + 32 = 666.

It is an interprime number because it is at equal distance from previous prime (1161561131) and next prime (1161561133).

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 1161561096 and 1161561105.

It is not an unprimeable number, because it can be changed into a prime (1161561131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16132758 + ... + 16132829.

Almost surely, 2^1161561132 is an apocalyptic number.

1161561132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1161561132 is an abundant number, since it is smaller than the sum of its proper divisors (1774607376).

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

1161561132 is a wasteful number, since it uses less digits than its factorization.

1161561132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32265597 (or 32265592 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 1161561132 is about 34081.6832330799. The cubic root of 1161561132 is about 1051.1887163186.

The spelling of 1161561132 in words is "one billion, one hundred sixty-one million, five hundred sixty-one thousand, one hundred thirty-two".