1181568 has 64 divisors (see below), whose sum is σ = 3341520. Its totient is φ = 368640.

The previous prime is 1181563. The next prime is 1181573. The reversal of 1181568 is 8651811.

It is a happy number.

It is a Cunningham number, because it is equal to 1087²-1.

It is an interprime number because it is at equal distance from previous prime (1181563) and next prime (1181573).

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1181568² = 2792205877248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6438 + ... + 6618.

2^1181568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1181568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1670760).

1181568 is an abundant number, since it is smaller than the sum of its proper divisors (2159952).

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

1181568 is a wasteful number, since it uses less digits than its factorization.

1181568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 203 counting only the distinct ones).

The product of its digits is 1920, while the sum is 30.

The square root of 1181568 is about 1086.9995400183. Note that the first 3 decimals coincide. The cubic root of 1181568 is about 105.7189660177.

The spelling of 1181568 in words is "one million, one hundred eighty-one thousand, five hundred sixty-eight".