1181000 has 32 divisors (see below), whose sum is σ = 2765880. Its totient is φ = 472000.

The previous prime is 1180997. The next prime is 1181017. The reversal of 1181000 is 1811.

1181000 is nontrivially palindromic in base 3 and base 9.

It can be written as a sum of positive squares in 4 ways, for example, as 630436 + 550564 = 794^2 + 742^2 .

It is a super-2 number, since 2×1181000² = 2789522000000, which contains 22 as substring.

It is a zygodrome in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410 + ... + 1590.

2^1181000 is an apocalyptic number.

1181000 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 1181000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1382940).

1181000 is an abundant number, since it is smaller than the sum of its proper divisors (1584880).

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

1181000 is a wasteful number, since it uses less digits than its factorization.

1181000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202 (or 1188 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1181000 is about 1086.7382389518. The cubic root of 1181000 is about 105.7020229958.

Adding to 1181000 its reverse (1811), we get a palindrome (1182811).

The spelling of 1181000 in words is "one million, one hundred eighty-one thousand".