1161541056 has 84 divisors (see below), whose sum is σ = 3327925272. Its totient is φ = 357387264.

The previous prime is 1161541049. The next prime is 1161541063. The reversal of 1161541056 is 6501451611.

It is an interprime number because it is at equal distance from previous prime (1161541049) and next prime (1161541063).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14550 + ... + 50346.

It is an arithmetic number, because the mean of its divisors is an integer number (39618158).

Almost surely, 2^1161541056 is an apocalyptic number.

1161541056 is a gapful number since it is divisible by the number (16) 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 1161541056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1663962636).

1161541056 is an abundant number, since it is smaller than the sum of its proper divisors (2166384216).

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

1161541056 is a wasteful number, since it uses less digits than its factorization.

1161541056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35838 (or 35815 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 1161541056 is about 34081.3887041007. The cubic root of 1161541056 is about 1051.1826601626.

Adding to 1161541056 its reverse (6501451611), we get a palindrome (7662992667).

The spelling of 1161541056 in words is "one billion, one hundred sixty-one million, five hundred forty-one thousand, fifty-six".