1161045540 has 144 divisors (see below), whose sum is σ = 3728524800. Its totient is φ = 291631104.

The previous prime is 1161045539. The next prime is 1161045547. The reversal of 1161045540 is 455401611.

1161045540 is a `hidden beast` number, since 1 + 1 + 6 + 104 + 554 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (1161045547) 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 47 ways as a sum of consecutive naturals, for example, 659181 + ... + 660939.

Almost surely, 2^1161045540 is an apocalyptic number.

1161045540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161045540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1864262400).

1161045540 is an abundant number, since it is smaller than the sum of its proper divisors (2567479260).

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

1161045540 is a wasteful number, since it uses less digits than its factorization.

1161045540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986 (or 1981 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1161045540 is about 34074.1183304866. The cubic root of 1161045540 is about 1051.0331599473.

The spelling of 1161045540 in words is "one billion, one hundred sixty-one million, forty-five thousand, five hundred forty".